Tin-lead glaze would be more accurate but the use of enamel is just 
adding another confusing and un-scientific term to a field already 
bedevilled by lack of technical understanding - on analogy to modern 
enamel paints which look nothing like tin-lead glazes anyway. Enamelling 
is best kept to enamelled metalwares by archaeologists. As Mary pointed 
out the tin is merely an opacifier in a lead glaze but many glazes are 
opaque. Must try and get the conference book.

paul courtney
Leicester
UK