Tempil (60ml, 343 C/650 F) - 24421 AQ TL060 Temperature Indicating Liquid, 343 Degree C/650 Degree F, 60ml

Great product for brass annealing set up to make sure your temperature is in the correct zone.

Works as advertised.

Just what I needed to gauge heating time for annealing brass. As advertised. Easy to use.

Used it to try to judge how much to heat my 7mm rm brass. Used it on two pieces of brass to get the idea what I was looking for as I was using a drill 5/8 spark plug socket ( I think that was the size) and a propane torch. Found if I turned the lights off I could judge well enough without it ( light red ) and repeat.

I use the 700 and 750 degree TEMPILAQ to adjust the flame and rotational speed of my Annealeez brass cartridge annealing machine to achieve the ideal temperature range. Serious reloaders know that cartridge brass work-hardens with each reloading/firing cycle. Hard brass splits and lacks consistency. Annealing returns the brass to factory new ductile condition, and can be done many times. The "magic" is knowing exactly the right temperature and time so brass isn't over annealed, burned, or "just warmed' without any true softening. This paint works GREAT - but it always dries up in the bottle before it is used up (regardless of tightening the lid and storing in another air-tight container). I may try the pens next - although more expensive per oz of paint, they may actually last longer.