This puzzle is based on the squares before the one that says, "what color is this?".
This is a sequence of squares, try to follow the rule(s) for the puzzle.
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Using the OP's new comment that there are 6 allowable colors "red orange yellow green blue purple", it is now possible to see a pattern.
Those are the spectral colors, in that order.
So we have:
PURPLE (skip 5 - red orange yellow green BLUE)
BLUE (skip 4 - purple red orange YELLOW)
YELLOW (skip 3 - green blue PURPLE)
PURPLE (skip 2 - red ORANGE)
ORANGE (skip 1 - YELLOW)
YELLOW (skip 0 - YELLOW)
So the missing color is:
To be honest, I am not sure the puzzle was solvable without that extra comment. Red and green don't even appear in the puzzle so linking this to the primary colors seemed a stretch without the giveaway, nor was there enough data to jump to the conclusion that those colors were missing. Hence my original, completely serious but now clearly incorrect guess, that the answer was... light blue ; )
We'll see if this one is right now...