I've just collected from my 'firer' over a dozen pieces I've thrown, bisque fired then glaze fired (all cone 5/6). Heartbreak ... every glaze has washed-out/faded so much that there's hardly ANY colour on the pieces; the exception being the few pieces i underglazed before applying the (over-)glaze. It seems almost certain that the earthenware clay I'm using will 'devour' any glaze i apply unless i apply an underglaze first!!
Any thoughts? ... i certainly hope i don't have to buy shares in an underglaze manufacturer in order to deal with this!?!?!?!