re: Are your purple cakes turning blue?

Hey Dina

The cause may have to do with the fact that your eyes can see the difference between blue and violet light, but many cameras cannot. Similarly the camera may be able to see the difference between violet and magenta in cases where your eyes cannot.

Do you use any picture editing software? You can adjust the hue settings in most picture editing software or adjust the levels of red, green or blue colors separately.

I hope this helps.
Michal