Fortunately, thanks to a brother in art I have found a glassblower able to make retorts... finally the story will be a happy ending :)
We find ourself very often limited by the material we need, lastly, for a simple sublimation of Salmiac, I had to spend half of a day making essays, 4 trials for nothing ...
Modern material, apparatus, etc, sometime do not really fit for our works. Where to find now crucible of the quality of Hesse ? You have to make them by yourself ! Of course we have the advantages of modernity, and also the disavantages.
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