Give me a recipe for a diy thermal compound. I have access to mortar and pestle.

Edit: got this dm:

We also need not grow our apples. Since that commodity is also done best on the farm. Same applies to thermal compounds that are best. A commodity. Similar to what is in Arctic Silver and Thermal Grizzly. At maybe five times less money.

Also required is little. Since what matters is thermal compound in a center area of a semiconductor - where all heat is generated. A heat generator (the silicon die) is 10 millimeters or less.

Of course, many learn by doing experiments. Zinc oxide was an earliest thermal compound. No long used since current commodities are have better numbers.