Ready-to-use crystalline glaze that, when fired correctly, creates impressive, 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 thoroughly mixed. 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 the base.

Each subsequent brush stroke should overlap the previous one by about 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. A too-thin 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 protecting the kiln shelf.

Do not place glazed work directly on the shelf. Flowing glaze can permanently stick the work to the shelf and damage the 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 approximately 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

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, the thickness of the layer, the placement of the work in the kiln, and the actual temperature profile.

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

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