Optic Riddle

The students must guess the correct color.
Does it require an electronic device? No

1. Students receive a graphic with additive synthesis in which some colors are hidden (minimum 1, maximum 4).

2. The students’ task is to guess the hidden colors.

3. The proper color is the solution.

4. The solution’s color may indicate where the next puzzle is hidden (for example: a yellow envelope, a drawer with a green sticker, a blue box, etc.)

Find it here
https://pl.wikipedia.org/wiki/Barwa#/media/Plik:Synthese+.svg