Modern pottery clay is composed of minerals dug up from the earth, combined into an elastic mud we turn into functional wares that lasts thousands of years. Just amazing if think about it.
Glazes are also made up of minerals dug up from the earth, pulverized into powders and combined based on the chemical reactions to one another when heated to thousands of degrees to ignite their potentials and outcomes.
But there is one substance we can use to glaze pots readily accessible to anyone with a wood burning fireplace, pit, or stove. Wood ash.
I find this even more profound, taking a byproduct made during the burning process then using it during a hotter burning process to acquire something aesthetic. Something holistic.