The ancient painters' method of making oil (cooked oil) is as follows:
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The ancient painters' method of making oil (cooked oil) is as follows:
Pour 5 liters of walnut or flaxseed oil into a larger earthenware or heat-resistant glassware and heat it over a low heat, preferably with a sheet of metal on top of the fire for even heating. Put a small peeled onion in the oil and cover. Cook over medium heat for minutes. Take the Cretan powder (lead monoxide) into the warm oil (oil temperature about 70℃), stir carefully to avoid spilt. Continue to simmer for an hour and 45 minutes, for a total of two hours. In the process of cooking, the best oil temperature is to bubble small Onions (about 1℃). The onion should not bubble too much, never boil the oil, overheated oil will turn black. After adding the powder, the color of the oil should be orange, and it will gradually become light brown after cooking. If the oil color has not become light brown in the minutes after comparison, the oil temperature should be slightly increased, but it should not exceed 0℃. After the cooked oil is done, remove the onion, and filter out the impurities such as Dan with filter paper while it is hot. Pour the oil into the glass bottle, and seal the bottle fully to isolate the air. After the oil bottle is placed in the sun for a long time to dry, the oil color will gradually become clear, and the bottom of the bottle will also be accompanied by white sediment. The sun-cured oil can be used for painting. Mati resin and turpentine 6∶4 ratio of gentle heating and melting, and the same amount of tested oil (cooked oil) stirred to synthesize paste medium, can be used for classical transparent painting. If the cooked oil and resin oil are stored for a period of time (cooked oil for one month, resin oil for about ten days) and then mixed, its color will be clearer and cleaner.
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Oil painters have used the European classical master sun refining method to make toning media, the method is as follows.
Pour the linseed oil or walnut oil with an equal amount of water (or salt water) into a wide-mouth glass bottle, stir to mix, cover the bottle with a thin layer of gauze for air and dust, and leave it in the sun for a few weeks or two months. Try to mix the oil and water several times in the first week, and someone put clean sand in the oil and water to help the impurities in the oil to precipitate. After separating the oil and water, the impurities are filtered out, and the detected oil can be used to prepare a color toner. The method of detection can also be directly put the oil into a colored glass bottle, add a piece of dry bread or dry steamed bread, seal it with a thin cloth, and put it in the sun, and the oil color can become clear after two months. Dry surface can absorb impurities in oil and help precipitation. The oil is heated at 0 ~ 1 ° C before bottling, which also helps in detection. The tested oil can be prepared by adding % gloss oil and % turpentine oil.
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