Diazonium salt foam production problem (Balz-Schiemann)

Why dont you just buy it? Sigma has 10g for like 100 euro

Most online sources suggest that this substance is very slightly soluble in water.  So you should have it, if the process hasn't lost it.  This seems likely, since its not very stable.  And lucky, because its explosive.  So win-win.  Try again with a large vessel, if you believe you can handle the substance safely.

Thank you. Producing foam was not mentioned in the patent so I was worried I did something wrong.

I will probably try again using a large beaker so that the gas has a way out.

One more thing, I am not sure what solvent should I use to recrystallize it?

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Why shouldnt I just heat the solid in a round-bottomed flask?

Because it might explode and blow your hands off.