This small box contains a variety of papers and parchments, pens and inks, seals and sealing wax, gold and silver leaf, and other supplies necessary to create convincing forgeries of physical documents. Proficiency with this kit lets you add your proficiency bonus to any ability checks you make to create a physical forgery of a document.
But the text for the Alchemist's Supplies is much more vague:
These special tools include the items needed to pursue a craft or trade. Proficiency with a set of artisan's tools lets you add your proficiency bonus to any ability checks you make using the tools in your craft. Each type of artisan's tools requires a separate proficiency.
Is this listed in a book, or is it left up to the DM and Player to decide?