Raspberry Cone 6 (Mastering Glazes)
Recipe
Notes
While most of the Mastering Glazes book focuses on earthy, variegated tones, Raspberry provides a vibrant, clean color. Key Properties • Visual Appearance: A bright pink to burgundy color. It is a glossy and translucent-to-semi-opaque. • The Science: This glaze relies on the Chrome-Tin Pink effect (high calcium, no zinc, and low boron). • Surface: Smooth and glass-like. It "breaks" clear or white over sharp edges and highlights surface texture by pooling in crevices in a deeper, more concentrated color. • Expansion/Fit: This recipe has the highest thermal expansion of the major glazes in the book. This means it is more prone to crazing on bodies having lower thermal expansions. Likes (Pros) • Exceptional Color: A true raspberry color (without the flat plastic appearance common with commercial stains). • Beautiful on Texture: Because it is translucent, it looks best on carved porcelain or white stoneware. Some describe it as a "celadon" with a pink palette. • Durability: Like all Hesselberth/Roy recipes, acid-resistance and food-safety are priorities. • Temperature Sensitivity: It fires more matte and "true pink" at Cone 5, while becoming glossier and slightly more purple at a full Cone 6. Dislikes (Cons) • Expense: This is the most expensive glaze in the book to mix (because it requires such a high percentage of Tin Oxide). • Crazing Risk: If you use a clay body with low silica, you are almost guaranteed to see crazing over time. • Fuming/Contamination: Chrome is volatile. If you fire Raspberry next to a white glaze that contains tin, the chrome fume can turn areas of the white pots a faint, accidental pink. • Clay Body Sensitivity: It looks vibrant on white clay but can look muddy or "dirty" on dark, iron-rich stoneware. It needs a clean, light canvas to shine.
Description
From page 102 in Mastering Glazes book