Take one kilo of Hartshorn place it in a pyrex baking dish and replace the lid. Place the dish on a direct strong heat (careful not to break the dish). After some time a smoke will rise inside the container and a white powdery crystal will form on the inside of the lid, leaving a black dreg in the bottom. Collect the sublimated powder and discard the black impurites. Repeat this process at least 3 times with the same sublimated powder. This is the method of sublimating (and therefore purifying) hartshorn. It is possible that by the third time your sublimate will turn yellow-orange.

Next place this sublimate in a flask (or well sealed glass jar) with absolute alcohol for 1 week in a warm place. Afterwards decant the tinctured liquid. Distill this liquid and replace it onto its dregs (circulate it) at least 3 times. On the final distillation keep the clear spirit separate from the dregs. This clear spirit, which has taken a subtle tincture from the ammonium sublimate, has now a mineral character which will allow it to lift a tincture from some metallic salts. Basil Valentine suggests its use in the extraction of an oil from the glass of Antimony.

(Caution. Only use the clear distillate. The oil (tincture and salts) of ammonia is poisonous and should not be included in an final metallic tincture. For more insight into the KM read the Triumphal Chariot of Antimony by Basil Valentine.)