Lemon juice is not vital for consistency but is strongly recommended as it inhibits the growth of mold.
The mixture will form clumps as it cooks. Try to stir in as many of these as possible between microwaving. The mixture is ready when it is sticky and very clumpy. This will be easier to judge once you see how your first attempt ends up. It’s better to make an undercooked batch than an overcooked one, since the former is easier to salvage.
It will usually take 10 to 15 minutes for the mix to cool to room temperature. Knead the mix for this entire period.
You can coat the plastic wrap with lotion to prevent sticking. To make an easy airtight wrap, shape the mix into a log and roll the plastic wrap around it. Twist each end. The refrigerator is a fine place to store the mix, but any location out of direct sunlight, heat, and moisture is fine.
Take a piece of the cold porcelain and tear it apart gently. A well made batch will form teardrop shapes as it stretches and breaks. [2] X Research source If the inside of the clay feels sticky, knead in additional corn starch. If the cold porcelain is brittle or dry, it was probably overcooked. You can try adding a little more oil, or make an undercooked batch and knead the two together afterward.
You can add paint during the initial kneading while making the cold porcelain, but this will reduce its shelf life.
Dry pieces can be glued together using ordinary white glue.
How long this takes depends greatly on the size of your sculpture, the temperature, and the humidity of the air. Keep checking until it is hard.
There are many types of sealant and lacquers intended for clay, with various glossy or matte finishes. Clear acrylic sealer is a simple transparent option. There are several types of clay. [5] X Research source You should decide whether you want to make pots or sculptures with the clay. The same clay may not be appropriate for working on the wheel and making sculptures. [6] X Research source Then find an appropriate formula for making clay from the ceramics magazine.
