Thermo Yellow FX Thermo Chromical 150ml by Custom CreativeThermo Yellow FX Thermo Chromical 150ml by Custom Creative Paint that becomes transparent with increasing temperature (transition temperature + 29 Celsius). Solid color at room temperature will turn transparent from 81 degrees Fahrenheit to show the base on which it was applied. It is reversible, so it regains its solid color when the temperature is lowered. 2: 1 dilution. It can be used in any application from custom finishes to cosmetics.