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Glaze - Mayco / Mayco Crystalline Glazes CR

Mayco Crystalline Glazes CR

Mayco’s Crystalline glaze program offers a glazing process that will create opalescent crystals with more consistency, higher probability of growth and with a greater level of control over the location of crystal development.

The system involves the use of three products:
Engobes, Seeding Media and Crystalline Clear.

Each product and its role in the process is defined below:
Engobes are a clay-based coating that is applied to greenware or bisque.
In addition to providing color beneath the clear glaze finish, the Engobe serves to protect decorative design work from imperfections in or on the raw clay surface.
Seeding Media was designed to work in conjunction with Mayco’s Crystalline Clear to trigger macrocrystalline patterns in the Crystalline Clear glaze.
It is the placement of the Seeding Media that causes the crystalline process to occur.
A single dot of Seeding Media will create a localized area of crystal patterns while a light, overall wash will create a broad area of crystalline growth.
click photo on left to view larger image

General Use:
CR-100 Crystal Clear and CR-301 Seeding Media are designed to work in conjunction to create microcrystalline patterns in the clear glaze.

CR-KIT1 Crystalline Kit 20% Off
List Price $ 25.00 Your Price $ 20.00

Contains 2 Pint jars, one each of the following colors: CR-100 Crystalline Clear and CR-201 Dark Blue Engobe, + one - 4 oz Jar of CR-301 Seeding Media

Macro-Crystalline Glaze Process Using Mayco’s Engobes, Seeding Media and Crystalline Clear Glaze Macro-Crystalline glazes are renowned for their stunning beauty.

Product Application & Firing Process
Engobes: Apply 2-3 coats to a soft fired (cone 04) or fully fired (cone 10) stoneware or porcelain body (Note: the clay body must be capable of withstanding a cone 10 firing).
Seeding Media: Apply single dots or a wash (4 parts water to 1 part Seeding Media) on the Engobe-covered surface.
Crystalline Clear: Apply 3 coats over the Engobe and Seeding Media applications. This glaze MOVES and will require a basin to catch glaze drips. Application tip: Apply the first coat to the entire piece; stagger subsequent coats higher up on the ceramic ware to lessen the flow of the clear glaze from running off the ware.
Enter the firing program (below) into your programmable kiln controller and start the program.
a. Ramp 1: 9999 (take the kiln up to temperature as fast as possible) to 2300°F (1260°C)
b. Hold 1: 0.00
c. Ramp 2: 9999 to 2012°F (1100°C)
d. Hold 2: 6.00 hrs
Notes: While the recommended hold time is 6 hours crystals may be formed in as little as 3 hours.(Longer hold times will produce larger crystals, shorter hold times will produce smaller crystal growth). Test to verify compatibility of decorating colors other than Mayco Engobes as Crystalline Clear can be aggressive towards underlying colors. Thicker applications of crystalline Clear tend to produce larger crystals. Varying the thickness of the Engobes and Seeding Media, as well as the Crystalline Clear can produce vastly different and exciting results. Blending different Mayco Engobe can produce unique colors.

While the advent of programmable kiln controllers has greatly improved the success of developing crystals, obstacles still remain with the mystery of the crystalline generation.

The Crystalline Glaze series has been discontinued. Available only while current stock lasts.


Color Description Unit Qty Add
CR 301 Seeding Media (Discontinued)   Add
CR 205 Pink Engobe (Discontinued)   Add
CR 203 White Engobe (Discontinued)   Add
CR 201 Dark Blue Engobe (Discontinued)   Add
Glaze - Mayco / Mayco Crystalline Glazes CR