There are two variants

Becoming a lighter colour as the temperature rises and reversing back to the original darker colour as the temperature is reduced below the activation temperature point.

Becoming a darker colour as the temperature is cooled and reversing back to the original lighter colour when the temperature is raised above its activation temperature point.

Colour to colour, colour to translucent and translucent to colour are available, many variations can be blended.

Available Colours

Colourless to Colour: 19C Cold

Natural to Vermillion
Natural to Orange
Natural to Green
Natural to Blue
Natural to Magenta

Colour to Colour: 19C Cold

Bright Yellow to Green
Bright Yellow to Orange
Pink to Purple
Blue to Purple
Mint Green to Turquoise

Colourless to Colour: 30C Warm

Blue to Natural
Vermillion to Natural
Magenta to Natural

Colour to Colour: 41C Hot

Purple to Pink
Orange to Yellow

Temperatures:

Activation temperatures range from zero to 65°C.