Bleaching and coloring bamboo is one of the commonly used methods for processing bamboo handicrafts. Its specific processes are as follows:
First, bamboo bleaching method
1. Soak cooking method. Soak bamboo in 1% bleach solution for about 1 hour. Take out and place in 5% acetic acid solution and cook for 30 minutes. Remove the bamboo and wash it with clear water. Rinse the liquid attached to the bamboo and let it dry.
2. Sealed smoked method. Put the bamboo in a sealed container, smoke sulfur dioxide gas for 24 hours, then wash, rinse, and dry. Sulfur dioxide gas is poisonous. Take care to prevent poisoning.
3. Dip grinding method. Bamboo was immersed in wash water for 48 hours, then removed, ground with a straw with fine sand, washed, and dried.
Second, the bamboo coloring method
1. Pharmaceutical coloring method. Put the bamboo into a caustic soda or sulfuric acid solution and boil it for 3 to 5 minutes, then add the basic dye (such as "golden block" or "malachite green") to boil for 30 minutes, and the color will not fade.
2. Acid brushing method. Wipe the surface of bamboo first, apply dilute sulfuric acid to become black, apply dilute nitric acid to become auburn, immediately after the coloring, the bamboo will never fade.
3. Acid-spraying mud method. First wipe the bamboo surface, then apply dilute sulfuric acid or dilute nitric acid, sprinkle some mud on the bamboo surface, and bake it on fire. When the mud becomes yellow or auburn, wash the mud with water and form an irregular flower on the bamboo. "Spot", and bamboo attached to the mud will not change color.
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