Millisecond Forums

Hello,
I am creating a script with multiple trials set on a purple background image. however, between trials, there is a white flash before the next trial displays with the correct purple background image. How do I get rid of this flash? Alternatively, if I cannot get rid of the flash completely, is there a way I could diminish it by say changing the color of the flash to purple or gray?

Attached is the current script.

Thanks!
Montroy1612