This is a classic childrens magic effect, very well made, possibly for Magictrix. Includes a change box which allows the colours to vanish from the pallet and appear on the picture. Probably from the 1970s.
 
Instructions: Present
 
Condition:
Good/fair, gimmick in the frame warped and tends to stick, could be replaced, some wear and marks, envelope could do with being replaced as it has wear and tear.