Lesson 08, 11 October 2018
Thermochromic ink changes colour temporarily when reacted with heat. It is categorized into two types, reversible and irreversible.
- Reversible inks can change from colour-to-colour, colour-to-invisible (& vice versa) and colour-to-colour-invisible (tri thermochromic).
- Irreversible inks changes from invisible to colour.
Such inks have pragmatic commercial use as an indicator to authenticate the genuine goods when the color appears correctly, for food safety measures and forensic crime experiments.
Materials: Thermochromic pigment + binder, cotton fabric, silk screen frame, squeegee, plastic cups, stirrers
Mix pigment and binder (50-50) and stir well. Place fabric under screen frame and pour mixture across. Run mixture across frame with squeegee. Slowly remove frame and leave it to dry.
Material application:
Source:
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