Brief Description of Platinum Crucible Cleaning Method

Boil in dilute hydrochloric acid or dilute nitric acid, among which dilute hydrochloric acid is more convenient to prepare (1-1.2) mol/L hydrochloric acid solution). Note that the dilute hydrochloric acid used must not contain oxidizing agents such as nitric acid, nitrate, halogen, etc.

If it cannot be cleaned with dilute acid, use potassium pyrosulfate, sodium carbonate, or borax to melt and clean.

If there are still stains or the surface is black, use fine sand that has passed through 100 sieves without sharp edges and corners, moisten with water, and gently rub to restore the surface luster.