I may be able to help.
I am looking for a thermochromic ink or pigment that meets the following requirements. Can anyone help?
- must be reversible
- must go colorless at temps as high as 71C, 160F
- must rapidly achieve full color point during cooling, at pre-defined temp set points (examples: 155F, 150F, 145F or 68.3C, 65.5C, 62.7C)
- must be accurate within approx. 2 degrees F
- must be a sharp color contrast between colorless color and full color
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