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Tell me about the characteristics of gypsum base and production method

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Tell me about the characteristics of gypsum base and production method Empty Tell me about the characteristics of gypsum base and production method

Post by Admin Tue Oct 03, 2023 6:16 am

Tell me about the characteristics of gypsum base and production method
Pure gypsum base Leather rubber gypsum base produced in the Middle Ages, for hard support materials (wood, etc.) it is a better base. Gypsum has a strong adhesion and is compatible with most toning media. In addition to propylene, it is particularly suitable for oil paints because it is a completely oil base.
At the end of the Middle Ages, at the beginning of oil painting, most easel paintings were painted on wooden boards, mostly on plaster bases. Gypsum base does not contain oil, is not easy to change, and can remain pure white. As a result, classical transparent oil paintings from century to century still shine with a jewel-like luster.
oil or glue on the gypsum base.
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The traditional method of making gypsum base is as follows:
(1) Base material. Animal skin glue or water glue 70 ~ 0 grams, water 1 liter. Paint twice. You must wait until the first coat is completely dry before applying subsequent coats.
(2) Bottom paint. Glue, zinc white, gypsum 1 part each.
The first layer should be applied as thinly as possible, like a veil. This is conducive to the subsequent each layer to obtain a stronger adhesion.
The direction of the second coat should cross the first coat. Apply after the first layer has dried for half an hour, again, do not apply too thick.
The first layer and the layers after that, and so on, until the base is smooth, shiny, and white, and the wood grain is not visible anywhere. Generally, 5 to 6 coats are required.
It's absolutely necessary for a plaster base to be reapplied. Eight to ten coats is normal. A base with only one or two coats can be used, but it may flake or crack after drying. Because the first coat must be completely dry before the next coat can be applied, it is convenient to finish the gypsum base in a morning. Do not dry quickly in the sun or on a heater to avoid flaking of the color layer later.
In the hard support material to make a plaster base, many painters are used to pasting a layer of gauze or other cloth on the bottom plate first, so that the coating and the bottom plate can be combined more firmly, and because of a layer of gauze, the coating does not have to be too thick, and it will make the surface of the plate feel. Optional fabrics are: linen, white cloth, packaging cloth, gauze and so on.
The gypsum powder used for the gypsum base is plaster of Paris or natural hydrated ground plaster powder. Gypsum hardens when exposed to water. In order to increase the strength of the coating, one-tenth of the light calcium carbonate powder (referred to as light calcium powder) can be added when using plaster of Paris powder.
A pure gypsum base is not suitable for soft support materials. If the soft support material is used, it can be mixed with titanium dioxide, zinc white powder or Lide powder, and a small amount of glycerin (honey is better) is added to increase its flexibility.
When painting on the gypsum base, there may be oil absorption, which is a good phenomenon in a sense, because it means that the oil and the base are really fused together. If you need a non-oil absorbing base, you can apply a very thin layer of glazing oil or glue on the gypsum base.
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