First we start by putting one filter on the torch.
We put 2 filters and 2 flash light and combine the light.
Blue and red add together get Magenta
Green and yellow add together and get yellow
Red and green subtract and get yellow
Blue and red subtract and get Magenta
Blue and green subtract and get Cyan
There are 3 primary color s of light are red, green and blue. Each of them had their own properties, which create new colors when add or subtract to each other.