UV Reactive Putty

A bouncy putty that shows its true colour in the sun or under UV light!  The putty contains leuco dyes that vividly change colour when exposed to UV.  A fun reversible change that even Einstein could have used to demonstrate his science.

Age:  5 to 12 years
Included:  25g putty of one colour + UV light in metal tin & 1 instruction sheet
Minimum order: 12  (packs of 12)   FREE shipping