Generally, the mixing ratio of alum and water is 7:3, which is more suitable. Alum is large and small, which will be dull and difficult to dye evenly. The glue is too big and the alum is too small, which is prone to problems such as pen slip, ink and color loss.
Application mode
Glue alum water has the functions of cooking silk, fixing color and protecting pictures. Glue; Yellow gelatin, also known as gelatin, has better granular effect. When in use, soak in cold water for a few minutes to remove floating ash, add hot water and stir until all the colloidal particles are dissolved, but boiling water is not allowed, which will reduce the viscosity. Alum: Also known as alum, it is mainly produced in Lujiang, Anhui. Soak in cold water the first day and use it the next day.
Learn to master the proportion when preparing glue alum water. When alum paper is used, the rubber pen will slip. If the alum is too large, chemical reactions will occur, and the paper will be crisp. Use less alum. When cooked rice paper or cooked silk is made, the quality and thickness of paper are different, the amount of glue alum is different, and the proportion of glue alum water is different in different seasons. According to the mustard garden, the proportion of glue alum water should be six glue four in summer and eight glue two in autumn.