Evaporates in the bottle. I've used it two or three times and literally applied small dots of Tempilaq to the glowing brass, about 15 dots total. The bottle is now half full, not because I used that much, but because it quickly runs together when I open the bottle. Buy thinner and refresh your bottle here and there. Also keep the mouth of the bottle very clean. Otherwise, you will have to break the cap from dried tempilac that has accumulated on the cap and neck of the bottle. Yes, however, it is useful for glowing as a temperature indicator.
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