Ready-to-use crystalline glaze, which, when fired correctly, 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 trials, 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 vessel.
2. Second layer: start applying approximately at 1/3 height of the vessel, counting from its base.
3. Third layer: start applying approximately at 2/3 height of the vessel, counting from the base.

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

Do not apply the glaze too thickly or too thinly. Too much glaze can hinder or completely prevent 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. Every 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. The flowing glaze can permanently adhere the piece to the shelf and damage the kiln equipment.

Firing schedule in a kiln with controlled cooling

1. Heating to 1267°C.
2. Cooling to 1150°C and holding for 45 minutes.
3. Cooling to 1100°C and holding for 30 minutes.
4. Cooling to 1050°C and holding for 20 minutes.
5. Cooling to 1000°C and holding for 20 minutes.
6. Cooling to 960°C and holding 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 specified 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 program.

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 and distribution of crystals 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 testing it 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 workshop.

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