Alchemical Symbolism in the VMS

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My knowledge of alchemy is limited to Wikipedia, unfortunately. Hence my question: was alchemical salt known in the 15th century?

If by "alchemical salt" you mean a Salt that is a principle and not a salt, like Sulphur is not sulphur and Mercury is not mercury, no.

Common salt ("sal communi") yes, as an ingredient in various operations. For example at the last step of the recipe in the Verbum abbreviatum de leone viridi, it is used to purify Mercury. Several salts are mentioned in pseudo-Albertus magnus Compositum de Compositis. With the widespread pseudo-epigraphy in alchemy the attribution to famous authors is always suspect but manuscripts of the 15th century exist for these two works.

In Arabic alchemy, the basis of all Latin alchemy, ammonium chloride ("sal armoniacus") is preferred:
- In Rasis' treatise De aluminibus et salibus (12th century) it is the "best salt",
- It is mentioned 5 times in pseudo-Geber's Summa Perfectionis (13th century).