Is there any kind of thermochromic material and/or paint that is capable of changing its color in the range from 4-8°C (39-46°F)? I'm trying to paint a glass bottle and want a visual aid for its temperature.

  • It's not strictly thermochromic but LCD thermometers can cover this range so maybe there's something you can modify/attach (example) – Chris H Jul 20 '16 at 14:54
  • Back in the 80s, you used to be able to get these thermometers that were a plastic card, and the ink would change on it depending on the temperature, and tell you what temperature they were. It seems to be called a liquid crystal thermometer. I don't know if it's possible to get sensitivity at the temperatures you're looking for, but if they make ones for fridges, I would assume so. This might also be the tech behind the winter gloves that would change when they got cold. – Joe Jul 20 '16 at 16:38
  • Currently some beers have labels with elements that appear or change color around that temperature range ("perfect for drinking") – SF. Jul 21 '16 at 7:47

I found a supplier of raw thermochromic pigment active in the temperature range you are looking for. But to make it into paint you would have to add binder yourself.

Company is called Shenzhen Yu Mingjie Pigments Co., Ltd.

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Has different thermochromic pigments active in the ranges -5C to 78C

Be sure to specify the temperature range you are interested in.

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From this web site for Hallcrest is the following excerpt:

Hallcrest thermochromic formulations are available as a pigment or a liquid crystal screen ink. Colors and temperatures can be customized to your application and printing capability. Thermochromic Temperature Range: -10ºC to 69ºC (14ºF to 156ºF)

They have standard activation temperatures of 15°C, 31°C and 47°C, and offer special activation temperatures in the range of -10°C to 69°C.

For email and telephone go to this site.

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