Question

We’ve learned that the visible spectrum is typically defined as ROYGBIV (Red/ Orange/Yellow/Green/Blue/Indigo/Violet) thanks to Newton. But there are colors in our box of crayons that aren’t in this list. We can find many colors by mixing others. What colors would be mixed to make brown or gray? Refer to the CIE diagram in your answer

Answer 1

Actually visible spectrum have no defined boundary between each colours it is a continuous spectrum

and all other colour are actually mixture of this colours

like brown is mixture of black and red and yellow

and grey is mixture of black and white

again white is mixtue of all colours present in ROYGBIV

and black is abesence of all colours present in ROYGBIV

CIE chart

All the ROYGBIV colours are present in the blackbody radiation.