Quick Answer: The Primary Color Kit is an optics kit with three independently controlled red, green and blue light sources for showing additive colour mixing. Cyan, magenta and yellow filters are included for subtractive mixing.
Last updated: October 2026
Key Features
Three RGB light sources, each with its own rotary dimmer
Red, green and blue projection lenses
Cyan, magenta and yellow subtractive filters
Opaque viewing screen and experiment guide included
With the room lights lowered, students overlap the three coloured circles on the screen and see red and green make yellow, blue and green make cyan, and all three together make white. Turning the dimmers produces in-between shades and coloured shadows, and holding the filters in a white beam shows which colours a filter absorbs and which it lets through.
Frequently Asked Questions
What colours are produced where the beams overlap?
Red and green give yellow, blue and green give cyan, and red, green and blue together give white light.
Can subtractive mixing be shown with the Primary Color Kit?
Yes. The cyan, magenta and yellow filters are placed in front of the white beam to show which colours are absorbed and which pass through.
