Ready-to-use crystalline glaze that creates spectacular, unique crystals on the surface of ceramics during a properly conducted firing.

Crystalline glazes are considered one of the more challenging techniques in ceramic glazing. Achieving the desired results often requires many attempts, an appropriate formula, and a precisely selected firing curve. KJ Tools & Glazes were created to simplify this process. They are ready to use and applied similarly to standard glazes available on the market.

Key features

• ready-to-use crystalline glaze,
• designed for brush application,
  
• creates unique crystals during controlled firing,
  
• can be fired in various types of kilns according to the manufacturer's instructions.

Application method

Before use, the glaze should be mixed very thoroughly. The manufacturer recommends applying the glaze in three layers:

1. First layer: apply the glaze over the entire glazed surface of the vessel.
2. Second layer: start applying approximately at 1/3 of the vessel's height, counting from its base.
3. Third layer: start applying approximately at 2/3 of the vessel's height, counting from the base.

Each subsequent brush stroke should overlap the previous one by approximately 50%. This allows for an even layer of glaze.

Do not apply the glaze too thickly or too thinly. Too much glaze can hinder or completely inhibit crystal formation. Too thin a layer, on the other hand, can result in poor background coverage and limit the final effect.

Caution – glaze flows heavily

Crystalline glazes are very fluid during firing. Each piece must be fired on a properly prepared glaze catcher or a stand to protect the kiln shelf.

Do not place the glazed piece directly on the shelf. Flowing glaze can permanently stick the piece to the shelf and damage the kiln's equipment.

Firing schedule in a kiln with controlled cooling

1. Heat to 1267°C.
2. Cool to 1150°C and hold for 45 minutes.
3. Cool to 1100°C and hold for 30 minutes.
4. Cool to 1050°C and hold for 20 minutes.
5. Cool to 1000°C and hold for 20 minutes.
6. Cool to 960°C and hold for 20 minutes.
7. After the program ends, allow the kiln to cool naturally.

Kilns without controlled cooling function

After reaching 1267°C, allow the kiln to cool naturally to approximately 1150°C. Then, set the minimum power and maintain the temperature for 45 minutes. Repeat the process at subsequent temperatures, according to the times given in the firing schedule.

Manually controlled kilns

After reaching 1267°C, the manufacturer recommends allowing the kiln to cool naturally for about 30 minutes. Then, set low power and maintain a temperature of about 1150°C for 45 minutes. Between subsequent stages, allow the kiln to cool for about 30 minutes, then perform further holds according to the program.

Manufacturer's instructions and videos

Instructions for applying and firing KJ crystalline glazes

KJ Tools & Glazes instructional videos on YouTube

Important information

The final appearance of the glaze, the size of the crystals, and their distribution may vary depending on the ceramic body used, layer thickness, the placement of the piece in the kiln, and the actual temperature profile.

Before applying the glaze to a finished piece, we recommend conducting a test on the chosen ceramic body. Each kiln and thermocouple may operate slightly differently, so the program may need to be adjusted to the specific conditions of a given workshop.

Product intended for professional ceramic applications. When working, observe safety rules applicable in the workshop and use appropriate personal protective equipment.