It is difficult to say whether colour coding was in use in medieval pharmacies. On the whole I would suggest not.
Firstly, because documented sources don't mention colour coding until the 18th century onwards, when French pharmacists started bringing in standardised bottles and colour coding for dangerous elements and poisons, so they would be instantly recognisable by any student.
Secondly, because visual depictions suchYou are not allowed to view links.
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Apothecary's shop link to open a zoomable viewer) don't show colour coding in the jars.
![[Image: 2scene07.jpg]](https://www.wga.hu/art/m/master/xunk_it/xunk_it3a/2scene07.jpg)
Apothecary shop, 15th century fresco, Issogne Castle, Italy.
The technology of the time would not lend itself to colour coding jars. Jars would mainly be earthenware and hence uniform in nature. I doubt you would have glass jars in the 15th century for common use.
NOW - that is not to say that coloured jars would not have been in use. But I suspect they would have been kept for the upper classes, used as fancy display elements to underline their content of rare and expensive herbs, not in a standard apothecary shop where they could easily be broken in daily use.
So, why would they be in the Voynich? If they are high class apothecary jars, then my argument above suggests they are for display purposes, to show off the expensive elements within.