Medium Blue Liquid Underglaze is an electric blue color that is soft and bright at cone 05, becomes more intense and fluxes into a soft glaze-like surface at cone 6, and maintains a strong blue tone with a soft sheen all the way to cone 10. Though the underglaze does become glaze-like, a clear gloss glaze can give Medium Blue an impeccably smooth finish with good color at cone 05 and cone 6, but tends to cause some transparency in the surface at cone 10. Picture shows left=> right ^05, ^5 and ^10.
V-328 Iceburg Blue - Brackers Good Earth Clays
Amaco Velvet Underglazes - 16 oz. Sizes-Sherman – The Pottery Studio
AMACO Velvet Underglaze Pint Electric Blue
Amaco Glaze Pottery
AMACO VELVET UNDERGLAZES - V325 - BABY BLUE - Clay Art Center (Tacoma, WA USA)
Amaco Velvet Non-Toxic Semi-Translucent Underglaze Set 1 & 2 Oz. Jar
Underglazes Archives - Clay Art Center
Velvet Set #3 12 - 2 Oz Jars - Bracker's Good Earth Clays Inc.
V-326 Medium Blue (2 oz) Amaco Velvet Under-Glaze
Amaco Velvet Underglaze - Medium Blue V-326 - 2-oz. Jar