Different interpretations have been offered for the marginalia on fol. 66r of the Voynich manuscript. The text was tempered with and it is hard to tell what was the original message. I'll speculate that the word above the pot with yellow substance is 'mel', which means 'honey' in Latin and many other languages.
There is also a yellow spot on the tummy of the figure next to the pot, so I'll speculate that the composition is a recipe for plaster based on honey.
There are few 15th century examples of such recipe, but I chose the medical treatment of St. Lidwina of Schiedam, because her illness was within the period the VMs parchment was dated (She died in 1433) . She had a bad fall while ice-skating as a girl and remained paralyzed for the rest of her life. She developed deep soars that were treated with plaster of honey and wheatmeal.
Maybe St. Lidwina is calling :)