Chapter 6 - Colour Flashcards
Frequency in waves
The number of waves that move past a fixed point in a second and it is measured in hertz
Reflection - Reflective index formula
speed of light in air (Sine < x) divided by speed of light in other medium (Sine < Y)
If two resins that are incompatible which each other are mixed
it will give a milky film, the incompatible resin will not mixed, the molecules tend to segregate in separate groups.
if the resins differ in refractive index
the greater the difference in refractive indices, the more milky and less transparent
Main Wavelength is hue and hue is modified by?
red with a yellow undertone is?
red with a blue undertone is?
undertones which makes it an individual shade
Chromophores 8 groups
azo N=N
Azo methine CH=N-
Azoxy N=N=O
Nitroso N=O
Nitro Group O=N=O
Carbonyl C=O
Thio C=S
Ethynyl C=C
What waves cannot be seen under human eyes
UV light, infrared, gamma, x-ray, radiowaves
What is a ligand
Ligand is a molecule or ion that donate a pair of electrons to a central metal atom/ion. The donated electron pair forms coordinated bonds with the metal
Additive mixing
Complimentary colors are colors that are placed oppositely from one another in color wheel
E.g. like blue and yellow will give out neutral
Picture a additive color mixing diagram
Blue —- + —- green =
Green —- + —- red =
Blue —- + —- red =
Blue and green gives cyan
Green and red gives yellow
Blue and red gives magenta
When blue green and red added together it gives white
Define primary color and secondary color for additive mixing
Primary color - red green blue
Secondary color - yellow cyan magenta
Substractive mixing involves pigment since pigment absorbs light. Picture a substractive mixing diagram
Orange + yellow =
Yellow + green =
Green + blue =
Blue + violet =
Violet + red =
Red + orange =
Orange + yellow = medium chrome yellow
Yellow + green = light chrome lemon yellow
Green + blue = cerulean blue / prussian blue
Blue + violet = cobalt blue or ultramarine blue
Violet + red = magenta or crimson
Red + orange = scarlet or vermillion
Mechanism of substractive mixing
Each individual pigment in a mixture substracts some of the wavelength and some of the energy
