This thermochromic pigment is made up as a liquid paste compatible with any acrylic media. At normal room temperature the pigment appears coloured (orange) but at 27°C the colour disappears. When the temperature falls the pigment colouring re-appears.The ratio of acrylic base to colouring pigment depends entirely on the application and density of colour requiredWhen heated each colour turns into the colour of acrylic base used.Water soluble for easy cleaning and diluting5ml supplied in a plastic syringe.