"Safe" in what sense?Thermochromicity is not, in and of itself, a hazard. A material might be thermochromic and explosive, or thermochromic and toxic, or thermochromic and flammable ... or might be none of those things.
paint
Advantages of thermochromic materials, otherwise known as transition lenses, include the convenience of not having to switch to prescription sunglasses. A disadvantage would be not transitioning completely to a transparent state, or being too opaque.
thermochromic advantages
There are a few potential issues with irreversible thermochromic labeling when transporting items. If the temperature changes too much, the irreversible thermochromic label could fade or become unreadable. If the temperature gets too hot, the irreversible thermochromic label could melt or become distorted. If the temperature gets too cold, the irreversible thermochromic label could crack or become brittle.
Mixing the thermochromic pigment with paint in the ratio of 20%~25%.
cost of materials and labor
mood rings, and food storages are commonly used with thermochromic paints.
$12,482.30
Depending on the brand and materials it can cost up to £35 or more.
I don't believe thermochromic paper is made, there is a dye, ink or paint. No paper. And u are going to soak paper in a chemical?
depends on the size and choice of materials.