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Control over both color and transparency is reported for the thermochromic materials presented here. Dyes such as Bromothymol Blue (BB) can reversibly change color with temperature when embedded in aqueous polyether/LiCl gel networks. The Figure shows a gel containing BB at room temperature (green, transparent) and at 33 °C (yellow, transparent). At 36 °C the gel becomes milky.
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Seeboth et al. (2000) studied this question.
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