31
05
2010
How does adding a little blue make appear black blacker and white whiter?
How is it that ‘blue-back’ appears blacker than actual black, e.g. eyelash dye, and bluish-white appears whiter than actual white, e.g. blue colourants added to washing powder to make whites appear brighter?
It’s intuitively illogical that blue could achieve both ends, yet it’s true. How is it so?
Sorry, title should read "made black appear blacker…"
Black: Adding blue increases the absorption of blue light making the black appear darker (Subtractive color)
White: Both sun light and incandescent light is slightly yellow. Add blue and the white appears brighter (Additive color)
http://en.wikipedia.org/wiki/Subtractive_color
http://en.wikipedia.org/wiki/Additive_color
sorry, just did this for points!
References :
Black: Adding blue increases the absorption of blue light making the black appear darker (Subtractive color)
White: Both sun light and incandescent light is slightly yellow. Add blue and the white appears brighter (Additive color)
http://en.wikipedia.org/wiki/Subtractive_color
http://en.wikipedia.org/wiki/Additive_color
References :