Temperature for not overheating your gear?

[Dominikanac]

I don't know maybe stupid question but what should be temperatures for oil while we mixing it with raw powder? I don't wish to overheat my gear and i want it be nice pretty sexy yellow color
I guess melting temperature of powders have nothing to do with it. And however oil we heat first and then let it cool down before we mix it with powder bb and ba.. But what temperature of oil should be while we mix it around 35-40c?
Thanks