This is a good question and I am so glad you asked. We are in the business of art, my husband and I. He does sparkling Florida landscape paintings and murals of Italian countryside. When he is done with a painting, he gives me his palette. Sometimes I come to my work table and there is a freshly pulled film of paint sitting there waiting. Heart, be still. Here is an example of David's art.
So that's one place the paint comes from.