How to remove gouache pigment mixed with propylene from blackboard newspaper?

Method 1: Clean with industrial alcohol or acetone. Propylene pigment is insoluble in water, but it softens and expands slightly when it meets water. Once expanded, it will peel off naturally, so it can be washed off with water.

Method 2: 4 parts of ammonia water with the concentration of 10%, 1 part of soda ash (sodium carbonate), 2 parts of white soap and 4 parts of alcohol can be mixed with 100 part of water, and the cloth can be soaked in the mixed solution, then wiped until the stain is removed, and then rinsed with clear water.

Method 3: Wash the stained area with turpentine, and then wash it with washing powder.

Method 4: If dripping on clothes, drop cool oil (or wind oil, toilet water, white wine, etc. ) on the stain, then drop some milk on it after a few minutes, and then wash it with washing powder or soap after a few minutes.

Method 5: Rinse with sodium zinc solution and banana oil (or gasoline), then rinse with soap and dry.

Extended data:

Characteristics of propylene pigment:

(1) can be diluted with water for easy cleaning;

(2) Quick drying. Paint can be dried in a few minutes after putting pen to paper, instead of waiting for months to polish it like oil painting. Painters who like slow-drying characteristic pigments can use retarders to delay the drying time of pigments;

(3) After drying, the colored layer will quickly lose its solubility and form a tough, elastic and impermeable film. This film is similar to rubber;

(4) The color is full, dense and fresh, and no matter how it is blended, it will not feel "dirty" or "gray". The colored layer will never have oil absorption and pollution;

(5) the durability of the work is long. The oil film in oil painting is easy to oxidize, yellow and harden, and it is easy to crack the picture after a long time. Theoretically, the propylene film will never be brittle and will never turn yellow;

References:

Propylene Pigment Baidu Encyclopedia