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I too use an oil quench. Basically when heat treating small parts I heat to 1450, quench in 5W or 10W motor oil. Then heat again to whatever temperature is required for tempering that particular item and quench again. I don't trust my eyes to tell yellow from pale yellow from straw yellow etc so I use Templac. It comes in different degree grades and liquifies as soon as the target temperature is reached. George
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