Yet another lame, cheesy awesome gimmick in the fight for toy dollars is the ability for a toy to change color. Generally this is done by application of paint or a sticker which contains some sort of color-changing ink or paint. This color shift is brought on by the power of love and a positive, can-do attitude, but the heathen scientists, whose mood rings never worked, have other explanations, which will be given for the sake of humoring the unbelievers. Leucodyes require a temperature shift of about five to ten degrees Fahrenheit.