A vase I turned from epoxy that was left over from castings and a piece of a Walnut log my neighbor gave me. I used 5 minute epoxy to glue the two together.
I do have 2 pressure pots, A 5 gallon and a 2 1/2 gallon but no, When casting pen blanks, Duck Call blanks or other small castings that do go in the pots I usually have an ounce or two left over so I add color if needed and dump in in a used mixing container. Hence the rings of color. In tiny amounts the resin I use completely de gasses by itself.
That is really neat - is the casting a product of a pressure pot ?