Ammonia? Ammonia is an alkaline and as such will break down shellac. It can also do wonky things to the color of the shellac and can potentially change the color of the wood. Clean your shellac brushes in ammonia if you want but don't thin the shellac with it! Alcohol remains the preferred thinner for shellac, period.
"You can lead a man to logic, but you cannot make him think." Joe Harz
"Always certain, often right." Keith McCafferty
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