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Home heating oil is what I used to quench about 10,000 jackhammer tool
steels. For small stuff a coffee can full will work well, it doesn't
flare up badly if you get the tool under the surface. Control the stink
by adding a little marvel mystery oil. It's best to set your coffee can
inside another can you can drop a lid on. If you get good you can
harden and temper in one heat by interrupting the quench but usually
nobody develops that skill on one of a kind items.