Its possible and rather easy to create a surface that changes its appearance to the touch, or to the contact of an object.
Imagine a perfectly normal table, black and shiny, which turns pink, or green, or which reveals patterns, when you lay your hands, a dish, or a glass onto it.
This can be achieved of course with any object or surface: for example, a tray.
It is simply by changing the surface temperature that the colour change is observed.
To make this table that changes colour when touched, you need the following:
Two-coloured change:
– A table
– Some primer or background paint
– Some thermochromic paint
– Some clear coat
1 – Prepare the surface, in this case wood: fine sand, then dust. A filling primer for wood should ideally be applied to create a waterproof and perfectly smooth surface.
http://www.stardustcolors.co.uk/98-primer-adhesion-promoter
2 – Apply the first pass of colour: choose a light tint, such as white, beige, grey, apple green or yellow… You can draw patterns if you wish.
This first coat will be the hidden coat, that is the coat that will appear.
3 – Apply the thermochromic paint: This paint is available in black, blue or red and in different temperature values.
Two tips about how this paint is working: It becomes transparent when its heated beyond a certain temperature, for example 260C: The change in the appearance of the paint is not introduced abruptly, but in a gradual manner.
If a bright yellow background is applied, and green leaves have been designed on top, all this becomes visible when the thermochromic paint disappears.
4 – The topcoating process provides a beautiful gloss, or a satin effect, and protects the paints.
Multicoloured change:
The steps remain the same, but it is necessary to use a special thermochromic paint, that will show several colours. This paint called PULSAR is unique. It cannot be rendered opaque or transparent, but it changes colour when between 29 and 40C.
http://www.stardustcolors.co.uk/thermochromic-paint/249-thermochromic-dyes.html
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