Janice’s thermochromic stickers coated with liquid crystals are called TLC Stickers and are round. The black TLC Dot Stickers change color when heated Touching the stickers with your fingers raises the temperature of the liquid crystals above room temperature (ambient temperature). When cooled back to room temperature the sticker turns black again.
Janice’s Stickers with thermochromic leuco dyes come in two types, HAT Stickers and CAT Stickers. Both of these sticker types are coated with a mixture of thermochromic Leuco dye and acrylic paint. HAT Stickers, like TLC Stickers are activated above room temperature, but unlike TLC stickers, the is a color change from that viewed at room temperature to a single color when heated. The color change is reversible been cooled.
CAT Stickers at room temperature have a color that changes when the sticker is cooled.
All the thermochromic stickers are reversible, meaning they have one color at room temperature and another when the temperature changes. But return to their room temperature color. This back and forth color changes occurs again and again over a relative long time period as long as the stickers are raised or lowered to extreme temperatures (also UV light can damage these stickers).
Special Sticker Characteristics
One thing that makes the Janice VanCleave Thermochromic Stickers special is that their color change is altered easily with low temperature changes. This can be done with with ice, body heat, hot or cold water, as well as solar heat.
Another special feature of the Janice VanCleave Thermochromic Stickers are their size, which makes them easy to use for DIY art/craft projects as well as science experiments.
FAQs About Thermochromic Materials
1. Is color change a chemical change? Yes, thermochromic chemicals change color because their molecular shape changes.
For other questions and answers, see the FAQs in the side bar or use the Ask Janice to send your own questions.
Janice VanCleave Thermochromic Stickers
TLC Stickers are coated with Thermochromic Liquid Crystals (TLC). For science project ideas, experiments, DIY project ideas and more information about liquid crystals, use the TLC Sticker links in the side bar.
HAT Stickers are coated with a mixture of thermochromic dye and acrylic paint. The paint color is not affected by fluctuations in temperature, thus the paint color affect the color of the sticker at low temperatures and is the only visible color at high temperatures.
For science project ideas, experiments, DIY project ideas and more information about heat activated thermochromic dyes, use the HAT Sticker links in the side bar.
CAT Stickers are coated with a mixture of thermochromic dye that is clear at room temperature and colored at a temperature less than room temperature.
For science project ideas, experiments, DIY project ideas and more information about cold activated thermochromic dyes, use the HAT Sticker links in the side bar.