Abstract
Alkali flux cakes are placed together with a beaker containing hydrochloric acid in a vacuum desiccator and after partial evacuation the acid is allowed to isothermally diffuse into the cake. Dissolution takes place without danger of loss by splattering and at the same time the acid is highly purified. Also other samples like alloys of magnesium and aluminium can in this way be dissolved in high purity hydrochloric acid. Brass is opened by isothermal diffusion of fuming nitric acid. Teflon crucibles and dishes are investigated to perform fusions under overhead radiation from focused projection lamps. The best flux was found to be potassium hydroxide containing about 15% water.
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