Ready-to-use crystalline glaze, which, when properly fired, creates spectacular, unique crystals on the surface of ceramics.

Crystalline glazes are considered one of the more challenging techniques for glazing ceramics. 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 thoroughly mixed. The manufacturer recommends applying the glaze in three layers:

1. First layer: apply the glaze to the entire glazed surface of the piece.
2. Second layer: start applying approximately at 1/3 of the height of the piece, counting from its base.
3. Third layer: start applying approximately at 2/3 of the height of the piece, 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 thick or too thin. 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.

Note – the glaze flows strongly

Crystalline glazes are very fluid during firing. Each piece must be fired on a properly prepared glaze catcher or a stand protecting 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 equipment.

Firing program for kilns 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 program.

Manually controlled kilns

After reaching 1267°C, the manufacturer recommends allowing the kiln to cool naturally for approximately 30 minutes. Then set low power and maintain a temperature of approximately 1150°C for 45 minutes. Between subsequent stages, allow the kiln to cool for approximately 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 and distribution of crystals may vary depending on the ceramic body used, the thickness of the layer, 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 sample on the chosen ceramic body. Each kiln and thermocouple may operate slightly differently, so the program may need to be adjusted to the conditions of a particular studio.

Product intended for professional ceramic applications. During work, safety rules applicable in the studio should be followed, and appropriate personal protective equipment should be used.