|Amaco Velvet underglaze on Waxy White Glaze (recipe below), on Laguna's 900 claybody|
If she had asked me, I would have told Jesse not to do it; putting underglaze on top of glaze, I would have predicted, would have crusty, unpleasant results. And I would have been so wrong! She did it, and - surprise! - the underglaze maintained its brilliant, right-out-of-the-jar colors, but took the waxy sheen of the glaze. Not all of them - blue turned watercolor-y and periwinkle, the black & brown were...not great - but the hot colors were amazing. Red & orange & yellow like I've never seen in reduction.
So I tried it, with the few underglazes I had lying around, and had the same results! All of the underglazes used were Amaco's Velvet series; I applied mine in 3 coats. (Jesse didn't know exactly but she said "thick." I used Flame Orange, Radiant Red, and Royal Blue. As you can see, the Royal Blue turned more of a watercolor-y periwinkle; the others are right-out-of-the-jar hues.
|Amaco's velvet underglaze on Waxy White Glaze|
on Laugna's 570 porcelain
We only tried one glaze (so far!), and that is this one:
Waxy White (not sure the origin, but I got it at Portland Pottery)
4100 Custer Spar
1200 Gerstley Borate