“The human eye is extraordinarily sensitive to light,” Dr. Woods said. Throw a few dozen photons its way, a few dozen quantum-sized packets of light, and the eye can readily track them. […]

N.I.S.T. disk number two was an example of advanced ultra-black technology: elaborately engineered arrays of tiny carbon cylinders, or nanotubes, designed to capture and muzzle any light they encounter. […] The N.I.S.T. ultra-black absorbs at least 99.99 percent of the light that stumbles into its nanotube forest. But scientists at the Massachusetts Institute of Technology reported in September the creation of a carbon nanotube coating that they claim captures better than 99.995 of the incident light. “The blackest black should be a constantly improving number,” said Brian Wardle, a professor of aeronautics and astronautics and an author on the new report. “Folks will find other materials that are blacker than ours.” […]

Psychologists have gathered evidence that black is among the most metaphorically loaded of all colors, and that we absorb our often contradictory impressions about black at a young age. […] Participants were asked to link images with traits. Which boy was likeliest to cheat on the test? Which man was likely to be in charge at work? Which girl was the smartest in her class, which dog the scariest? Again and again, among both children and young adults, black pulled ahead of nearly every color but red. Black was the color of cheating, and black was the color of cleverness. A black tie was the mark of a boss, a black collar the sign of a pit bull. Black was the color of strength and of winning. Black was the color of rage. […]

Diemut Strebe, an artist in residence at M.I.T., collaborated with Dr. Wardle on a project that would merge carbon at its most absorptive configuration, in the form of carbon nanotubes, with carbon in its most reflective and refractive state, as a diamond. One of their biggest challenges: finding a jeweler willing to lend them a chunky diamond that would be plastered with what amounts to high-tech soot. “I tried many companies, Tiffany, others,” Ms. Strebe said. “I got many no’s.” Finally, L.J. West Diamonds, which specializes in colored diamonds, agreed to hand over a $2 million, 16.78-carat yellow diamond, provided the process could be reverse-engineered and the carbon nanotube coating safely removed. The resulting blackened bling is on view at the New York Stock Exchange, which Ms. Strebe calls “the holy grail of valuation.”

{ NY Times | Continue reading }

Evolutionarily minded researchers have hypothesized that women advertise their ovulatory status by wearing red or pink, but many of these studies have been based on relatively small samples of women who have self-reported their clothing choices, an unorthodox practice in the biological study of coloration. […] We found no evidence that women are particularly inclined to wear red or pink during peak fertility.

{ PsyArXiv | Continue reading }

related { our meta-analyses help synthesize the evidence that red enhances perceived attractiveness in romantic contexts }

Grapheme-color synesthesia is a neurological phenomenon in which viewing a grapheme elicits an additional, automatic, and consistent sensation of color.

Color-to-letter associations in synesthesia are interesting in their own right, but also offer an opportunity to examine relationships between visual, acoustic, and semantic aspects of language. […]

Numerous studies have reported that for English-speaking synesthetes, “A” tends to be colored red more often than predicted by chance, and several explanatory factors have been proposed that could explain this association.

Using a five-language dataset (native English, Dutch, Spanish, Japanese, and Korean speakers), we compare the predictions made by each explanatory factor, and show that only an ordinal explanation makes consistent predictions across all five languages, suggesting that the English “A” is red because the first grapheme of a synesthete’s alphabet or syllabary tends to be associated with red.

We propose that the relationship between the first grapheme and the color red is an association between an unusually-distinct ordinal position (”first”) and an unusually-distinct color (red).

{ Cortex | Continue reading }

A Black, E white, I red, U green, O blue: vowels,
Someday I shall tell of your mysterious births

{ Arthur Rimbaud | Continue reading }

art { Roland Cat, The pupils of their eyes, 1985 }

…the immaculate ultrawhite behind the French doors of a new GE Café Series refrigerator […] the white hood of a 50th anniversary Ford Mustang GT […] the white used to brighten the pages of new Bibles, the hulls of super yachts, the snowy filling inside Oreo cookies […]

All this whiteness is the product of a compound known as titanium dioxide, or TiO2. A naturally occurring oxide, TiO2 is generally extracted from ilmenite ore and was first used as a pigment in the 19th century. In the 1940s chemists at DuPont refined the process until they hit on what’s widely considered a superior form of “titanium white,” which has been used in cosmetics and plastics and to whiten the chalked lines on tennis courts. DuPont has built its titanium dioxide into a $2.6 billion business, which it spun off as part of chemicals company Chemours, in Wilmington, Del., last fall.

A handful of other companies produce TiO2, including Kronos Worldwide in Dallas and Tronox of Stamford, Conn. Chemours and these others will churn out more than 5 million tons of TiO2 powder in 2016. China also produces large amounts of the pigment, and its industries consume about a quarter of the world’s supply. Most of China’s TiO2 plants, however, use a less efficient and more hazardous process than the one developed at DuPont. Starting in the 1990s, if not earlier, China’s government and Chinese state-run businesses began seeking ways to adopt DuPont’s methods. Only they didn’t approach the company to make a formal deal. According to U.S. law enforcement officials, they set out to rip off DuPont.

“At first, you’re like: Why are they stealing the color white?” says Dean Chappell, acting section chief of counterespionage for the FBI.

{ Bloomberg | Continue reading }

oil on wood { Ellsworth Kelly, White Plaque: Bridge Arch and Reflection, 1951-55 }

In 2012, a genetic analysis confirmed that Concetta’s enhanced color vision can be explained by a genetic quirk that causes her eyes to produce four types of cone cells, instead of the regular three which underpin colour vision in most humans. […]

Women with four cone types in their retinas are actually more common than we think. Researchers estimate that they represent as much as 12% of the female population. […] A woman has the potential to produce four cone types because she inherits two X-chromosomes. […]

The three cone types that most of us have in our retinas allow us to see millions of colours. Each cone’s membrane is packed with molecules, called opsins, which absorb lights of some wavelengths and cause the cone to send electrical signals to the brain. […]

Four cones don’t automatically grant you superior color vision. […] Only one of the seven women with four cones behaved as if she actually perceived differences between the colour mixtures that were invisible to everyone apart from her sons.

{ The Neurosphere | Continue reading }

{ Women Who Dye Their (Armpit) Hair | NY Times | Photo by Ruth Fremson }

We explore how product images and color in business plans influence venture investment screening decisions. Because images are accessible, memorable, and influential, we argue that product images in a business plan will increase the likelihood of favorable judgments during screening decisions. Moreover, because red and blue automatically affect an individual’s cognition in different manners such that red elicits negative associations and blue elicits positive ones from the evaluators, we predict that the use of red in a business plan will decrease the favorability of judgments during screening decisions, while the use of blue will increase their favorability.

{ Journal of Business Venturing | Continue reading }

In a series of 7 experiments we demonstrate that women perceive men to be more attractive and sexually desirable when seen on a red background and in red clothing. […] The influence of red appears to be specific to women’s romantic attraction to men: Red did not influence men’s perceptions of other men, nor did it influence women’s perceptions of men’s overall likability, agreeableness, or extraversion.

{ APA PsycNet | Continue reading }

The researchers also found that men require a slightly longer wavelength to see the same hue as women; an object that women experience as orange will look slightly more yellowish to men, while green will look more blue-green to men.

This last part doesn’t confer an advantage on either sex, but it does demonstrate, Abramov says, that “the nervous system that deals with color cannot be wired in the exact same way in males as in females.” He believes the answer lies in testosterone and other androgens.

{ Smithsonian | Continue reading }

photo { Nicholas Nixon }

The study suggests that we have limited ability to perceive mixed color-shape associations among objects that exist in several locations. […]

Say, for example, a person sees a string of letters, “XOOX,” and the letters are printed in alternating colors, red and green. Both letter shape and letter color need to be encoded, but the associations between letter shape and letter color are mixed (i.e., the first X is red, while the second X is green), which should make neural synchrony impossible.

“The perceptual system can either know how many Xs there are or how many reds there are, but it cannot know both at the same time,” Goldfarb and Treisman explain.

{ APS | Continue reading }

graphite, paint, and ink on paper { Abu Bakarr Mansaray }

People usually associate the color black with aggression. Previous studies have revealed that people are perceived as more aggressive, and act more aggressively, when wearing dark clothes. To investigate the influence of black clothing on criminal justice agency personnel, this study examined whether police departments that wear dark uniforms are more aggressive than those that wear lighter uniforms. It was predicted that departments utilizing black uniforms would experience more assaults on officers, citizens killed by police, and excessive force complaints. No statistically significant difference was found between departments wearing black and light uniforms.

{ Criminal Justice and Behavior | Continue reading }

We tested whether eye color influences perception of trustworthiness. Facial photographs of 40 female and 40 male students were rated for perceived trustworthiness. Eye color had a significant effect, the brown-eyed faces being perceived as more trustworthy than the blue-eyed ones.

{ PLOS | Continue reading }

{ A new study suggests that if you’re looking for employment, wearing red is a bad decision }

photo { Nadav Kander }

Cerebral cortex has a very large number of testosterone receptors, which could be a basis for sex differences in sensory functions. For example, audition has clear sex differences, which are related to serum testosterone levels. Of all major sensory systems only vision has not been examined for sex differences, which is surprising because occipital lobe (primary visual projection area) may have the highest density of testosterone receptors in the cortex. We have examined a basic visual function: spatial and temporal pattern resolution and acuity. […]

Across the entire spatio-temporal domain, males were more sensitive, especially at higher spatial frequencies; similarly males had significantly better acuity at all temporal rates. […]

We suggest that testosterone plays a major role, leading to different connectivities in males and in females. But, for whatever reasons, we find that males have significantly greater sensitivity for fine detail and for rapidly moving stimuli. One interpretation is that this is consistent with sex roles in hunter-gatherer societies.

{ Biology of Sex Differences/NCBI | Continue reading }

We examined the possible sex differences in color appearance of monochromatic lights across the visible spectrum. There is a history of men and women perceiving color differently. However, all of these studies deal with higher cognitive functions which may be culture-biased. We study basic visual functions, such as color appearance, without reference to any objects. […]

There were relatively small but clear and significant, differences between males and females in the hue sensations elicited by almost the entire spectrum. Generally, males required a slightly longer wavelength to experience the same hue as did females.

{ Biology of Sex Differences | PDF }

image { Jaymes Sinclair }

Bees at a cluster of apiaries in northeastern France have been producing honey in mysterious shades of blue and green, alarming their keepers who now believe residue from containers of M&M’s candy processed at a nearby biogas plant is the cause.

{ Reuters | Continue reading }

In many restaurants throughout the world, wait staff’s income depends largely on the tips received from customers. According to this study, male restaurant customers give higher tips to waitresses wearing red. […]

Men gave between 14.6% and 26.1% more to waitresses wearing red, while color had no effect on female patrons’ tipping behavior at all.

{ SAGE | Continue reading }

photo { Nick Meek }

Research conducted during the 2004 Olympic Games in Athens showed that competitors in taekwondo, boxing and wrestling who wore red clothing or body protection had a higher chance of winning. The effect wasn’t large, but when the statistics were combined across all these sports it was undeniable – wearing red seemed to give a slightly better chance of winning gold. The effect has since been shown for other sports, such as football. […]

The researchers had a straightforward explanation for why wearing red makes a difference. Across the animal kingdom, red coloration is associated with male dominance, signaling aggression and danger to others. […] The researchers claimed that humans too are subject to this “red = dominance” effect, and so, for combat sports, the athlete wearing red had a psychological advantage. […]

Another research group analysed data from a different sport at the Athens Olympics, Judo, but they found that contestants who wore either white or blue had an advantage.

{ Mind Hacks | Continue reading }

Red seems to affect us in a way that other colors don’t. (…)

Johns and colleagues test an hypothesis for why red on women looks so attractive to me. The hypothesis is that red is sexy because it reminds men of… lady parts. (…) One version of the hypothesis is that as females are approaching ovulation, the vulva becomes more red than is is at other points in the cycle.

If this “red is code for female sex organs” hypothesis is true, you might predict that men would judge female genitals as more attractive as they became more red.

Explicit images of anatomically normal, un-retouched, nonpornographic, similarly-orientated female genitals were surprisingly difficult to obtain… We selected photographs that … did not contain other, potentially distracting, objects (fingers, sex toys, piercings etc.) and were hairless to account for current fashion.

They showed their pictures to 40 males. Most of the men were in their 20s. (…) They rated the attractiveness of each image.

The ratings of attractiveness were the exact opposite of those predicted by the signalling hypothesis. The reddest images were rated the least attractive.

The authors are then tasked to come up with an hypothesis as to why redness is less attractive. Their suggestion is that red is suggestive of menstrual blood.

{ NeuroDojo | Continue reading }

All natural hair colors are the result of two types of hair pigment. Both of these pigments are melanin types, produced inside the hair follicle and packed into granules found in the fibers.

Eumelanin is the dominant pigment in dark-blond, brown hair, and black hair, while pheomelanin is dominant in red hair.

Blond hair is the result of having little pigmentation in the hair strand.

Gray hair occurs when melanin production decreases or stops.

{ Wikipedia | Continue reading }

photo { Matthew Spiegelman }

Recent studies have noted positive effects of red clothing on success in competitive sports, perhaps arising from an evolutionary predisposition to associate the color red with dominance status. Red may also enhance judgments of women’s attractiveness by men, perhaps through a similar association with fertility.

Here we extend these studies by investigating attractiveness judgments of both sexes and by contrasting attributions based on six different colors. Furthermore, by photographing targets repeatedly in different colors, we could investigate whether color effects are due to influences on raters or clothing wearers, by either withholding from raters information about clothing color or holding it constant via digital manipulation, while retaining color-associated variation in wearer’s expression and posture.

When color cues were available, we found color-attractiveness associations when males were judged by either sex, or when males judged females, but not when females judged female images.

Both red and black were associated with higher attractiveness judgments and had approximately equivalent effects.

Importantly, we also detected significant clothing color-attractiveness associations even when clothing color was obscured from raters and when color was held constant by digital manipulation.

These results suggest that clothing color has a psychological influence on wearers at least as much as on raters, and that this ultimately influences attractiveness judgments by others.

{ Evolutionary Psychology | Continue reading }