MGBase5 - Glossy Clear Liner Cone 6 (Mastering Glazes)

Modified: 2025-12-30 04:21:03

From page 97 of Mastering Glazes book

Material	Amount
G-200 Felspar	20.00
Ferro Frit 3134	20.00
Wollastonite	15.00
EPK	20.00
Talc	6.00
Silica	19.00
100.00

Notes

Optimized for its role as an interior "shield."

Key Properties
• Visual Appearance: Crystal clear and highly transparent.
• The Science: This is a high-calcium, boron-balanced glaze. By balancing the Alumina and Silica levels, the authors created a glass that is resistant to corrosion.
• Surface: It creates a "glass-like" interior that is highly resistant to staining from coffee, tea, or metal spoon marks.
• Thermal Fit: It has a low-to-medium thermal expansion assuring "fit" on most bodies.

Likes (Pros)
• Unmatched Stability: It does not run, it does not crawl, and it rarely pinholes. It is the "safe bet" for the inside of any functional vessel.
• Easy Cleaning: Because the surface is so dense and glossy, it is the most "dishwasher-friendly" glaze in the Hesselberth/Roy collection.
• Shows Detail: If you use a white clay body or porcelain, this glaze makes the piece look like fine china. It also works well over slips or underglaze paintings without blurring the lines.
• No "Clouding": Many clear glazes turn milky or cloudy if applied too thick. The Page 97 Liner is formulated to stay clear even if the application is slightly heavy.

Dislikes (Cons)
• Strict Application: Because it is a "stiff" melt, it doesn't "heal" itself as well as some other glazes. If you have a bubble or a "crater" in your application, the glaze might not flow enough to fill it in during the firing.
• Highlighting Imperfections: Because it is clear, it hides nothing. Any iron spotting in the clay or dust on the bisque will be permanently trapped and visible under the glass.
• The "Clear" Paradox: In a book full of variegated colors, this glaze is visually "boring." It serves a purely utilitarian purpose, which can be less exciting for potters looking for artistic "magic."

Related Information

Links

Articles	G1214M Cone 5-7 20x5 glossy transparent glaze This is a base transparent glaze recipe developed for cone 6. It is known as the 20x5 or 20 by 5 recipe. It is a simple 5 material at 20% each mix and it makes a good home base from which to rationalize adjustments.
Articles	G1214W Cone 6 transparent glaze The process we used to improve the 20x5 base cone 6 glaze recipe to produce G1214W.
Firing Schedules	Mastering Glazes Cone 6 Six-step with controlled drops to 1000C and 760C
Typecodes	Recipes from Mastering Glazes Book Descriptions of these glazes often contain over-the-top adjectives like “scientifically formulated”, “perfect”, “exceptional”, “beautifully”, “engineered”, “specifically designed”, “sophisticated”, etc. Of course there are no perfect recipes to be discovered, they all inhabit spaces balancing a dozen different properties, tuning one most often affects one or more of the others. And, recipe is only one thing affecting the finished product, process factors can have even more influence on finished appearance and properties.
Typecodes	Medium Temperature Glaze Recipes Normally fired at cone 5-7 in electric kilns.
Typecodes	Transparent Glaze Recipe Transparent recipes can be difficult to develop because entrained bubbles, crystals and crazing are not hidden by color and opacity. In addition, they must be well melted to give good results. Generally transparent recipes are sought after as liner glazes or bases to which to add opacifiers and colors. Typically work is required to match a transparent glaze to a specific clay body.

XML to Paste Into Insight-live

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Glossy Clear Liner Cone 6 (Mastering Glazes)" keywords="From page 97 of Mastering Glazes book" id="46" date="2025-12-30" codenum="MGBase5">
<recipelines>
<recipeline material="G-200 Felspar" amount="20.000"/>
<recipeline material="Ferro Frit 3134" amount="20.000"/>
<recipeline material="Wollastonite" amount="15.000"/>
<recipeline material="EPK" amount="20.000"/>
<recipeline material="Talc" amount="6.000"/>
<recipeline material="Silica" amount="19.000"/>
<url url="https://digitalfire.com/recipe/46" descrip="https://digitalfire.com/recipe/46"/>
</recipelines>
<urls/>
</recipe>
</recipes>

By Tony Hansen
Follow me on

Got a Question?

Buy me a coffee and we can talk