Thanks! That sounds strange about the flux. So flux is a "supply" because it evaporates and there is no trace of it left in the final physical product. Is that the logic? Only stuff that becomes a physical part of the product is COGS? So for example metal, solder, beads etc. are COGS, but flux, polishing compounds, cleaning solutions, patina... along with polishing wheels, burrs, drill bits etc. are Supplies?
