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

Crystalline glazes are considered one of the more challenging ceramic glazing techniques. Achieving the desired results often requires many attempts, an appropriate recipe, 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 ware.
2. Second layer: start applying approximately at 1/3 of the ware's height, counting from its base.
3. Third layer: start applying approximately at 2/3 of the ware's height, counting from its 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. A too-thin layer, on the other hand, may result in poor background coverage and limit the final effect.

Note – glaze runs heavily

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

Do not place glazed work directly on the shelf. The running glaze can permanently stick the piece to the shelf and damage kiln 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 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 the temperature at 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 schedule.

Manufacturer's instructions and videos

KJ Crystalline Glaze Application and Firing Instructions

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, the 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 making 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 the workshop.

Product intended for professional ceramic applications. During work, safety rules applicable in the workshop must be observed and appropriate personal protective equipment must be used.