Artemis Reversible Thermochromic Pigments are solid solutions of heat sensitive dyes in a common thermoset melamine formaldehyde resin matrix, suitable for direct incorporation into most ink paint and plastic formulations. All shades are chemically equivalent, and may be blended to achieve intermediate shades.

These pigments become transparent above approximately 30ºC, and recover their original colour strength once ambient temperature returns to approximately 25ºC. This colour change cycle will repeat at least one thousand times in most applications.

All shades in the range comply with UK and EC Toy Regulations (EN71, part 3, Heavy Metals) and are generally considered to be non-toxic if used as recommended.

PHYSICAL PROPERTIES
Solubility	nil
SG	1.3
Particle (average)	10µm
Decomposition	above 200ºC

Application guidelines:
These pigments are quite robust, but should be dispersed by stirring only, not milled or ground. Processing temperatures should not be allowed to rise above 50°C. Mixing with non-opacifying colorants and effect additives is possible to achieve custom effects. The use of strong polar solvents should be restricted.

Application suggestions:
Reversible thermochromic coatings are often applied over contrasting colours, giving rise to an apparent colour change when subjected to gentle heat, or over text to reveal a hidden message. They may be combined with other covert effects in security applications. Contact Artemis for further details.

Storage:
TC pigments are generally stable in long term storage but should be kept in opaque, sealed containers protected from moisture and high light levels.