Examples from the Web for underglaze
Underglaze or Barbotine colours should be used, and they should be put on in thin washes.
The second great period, the Modern Renaissance (underglaze decoration), practically commenced in 1885.
The underglaze blue, employed at the old royal factory by Mller, was familiar from early Meissen days.
The narrow range of underglaze colours in a measure limits the results of the decorator of figures.
Metallic oxides are used to stain or color clear glazes, while underglaze colors are ordinarily used for matts.Industrial Arts Design|William H. Varnum