Milk Paint Cracking- Just Live With It?

[Peroni]

Potassium was not known in Roman times, and its names are not Classical Latin but rather neo-Latin.

It may not have been a known quantity in Roman times, but it's properties were utilised from substances like wood ashes.

Birch bark ash was used in hair dye. Ash contains a certain ammount of potassium (potash) This is also why ashes are good for the garden. It can contain Nitrates which help plant growth.