What is the Alum Powder used for Chinese painting?

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    • #13921
      罗雁 LuoYan
      Keymaster

      I know Alum Powder is very often used in both Chinese painting and mounting. However, what is it? And how much should I use?

      • This topic was modified 3 years, 11 months ago by 罗雁 LuoYan.
    • #13922
      罗雁 LuoYan
      Keymaster

      Recently, one of INKSTON clients kindly helped us confirmed that the Alum Powder is in fact Potassium Aluminium Sulphate. This is important because then people can find it easily and economically in their own country.

      We normally grind this chemical into fine powders so that it can dissolve easily in water. I found in several books that when dissolve the alum powder, you cannot use water over 64°c because water over this degree will cause chemical reactions on Potassium Aluminium Sulphate.

      As for how much Potassium Aluminium Sulphate is used needs attention too because Potassium Aluminium Sulphate actually might ‘damage’ the paper. In Chinese, we call this ‘bite paper’. You can consider 10g Potassium Aluminium Sulphate for 500g water.  In winter, around 10% lessPotassium Aluminium Sulphate is used. ​

      If you need to make glue for Chinese painting, you can use this powder and animal skin/ bone to make special glue. Such glue helps to size different types of papers. This glue can also help lock and enhance colours when painting. Especially when you need to apply quite a few layers of colours on paper, every one to two layers would need you to apply a layer of diluted glue water. This helps a lot when you need to paint many layers of colours. It can keep the clours from ‘mixing’ with other colours. This technique was used for Mo Gao Cave Mural paintings and helped to preserve these precious paintings for over 1300 years. Even nowadays, the bllue azurite, malachite greens are still very bright.

      The two top natural colours manufacturers in China normally have added high end animal glue in their natural colours. However, if you need, you can control the percentage of the glue used in their colours by ‘washing the colour chips/ sticks’ or by adding extra glues in the colours. It is easier for you to reduce the glue percentage for Jiang SiXu Tang’s colour chips than Old Hu Kai Wen inksticks. They both are very fine materials for Chinese painting and Tang Ka painting.

      https://www.inkston.com/shops/inks/jiang-si-xu-tang-natural-mineral-colours/

      矿物质高级彩墨 Natural Minerals 12 Colours Set

       

       

      • This reply was modified 3 years, 11 months ago by 罗雁 LuoYan.
      • This reply was modified 3 years, 11 months ago by 罗雁 LuoYan.
    • #13962
      罗雁 LuoYan
      Keymaster

      Traditionally the portion is 10g alum for half litre water. Normally two teaspoons would be around 10g. For tablespoon, I would say 2/3 tablespoon would equal 10g. Then try 2 to 2.5 cups of water. (one teaspoon values around 5g; one cup values between 1⁄5 and 1⁄4 of a liter)  🙂 Hope this is helpful!

    • #14060
      Discipleingleno
      Participant

      Alum water is also used as a waterproofing wash, shown here in this china daily article on fan-making:

      http://www.chinadaily.com.cn/culture/art/2017-08/24/content_31045699_8.htm

      A craftsman brushes a layer of alum water on the fan to make it water-proof. [Photo/IC]

    • #18935
      StudentDavid
      Participant

      I find that when I use Alum powder in the ink it creates an aquatint effect.

      Ie it seperates the pigment into small dots ( much like an aquatint in etching) .

      This has probably because alum acts like a flux and seperates the pigment from the water.

      The other interesting phenomena is that when I add an extra colour ,say blue to the black ink ,the blue will be cats out of the line causing an interesting ‘ halo ‘ effect with the line.

      We call it the magic ingredient .

    • #21169
      Elec
      Participant

      As alum acidity could damage the paper, I was wondering if it could also be harmful for your brushes. Does anyone know?

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