The discoloration of the paint mainly refers to the discoloration of the varnish. The varnish is originally transparent, colorless or extremely pale yellow. After discoloration, it becomes brownish yellow or black. The color paint also has a phenomenon of discoloration, which is mainly manifested by the dark color of the color paint.
The reasons for the discoloration of the paint may be as follows:
1. The ester solvent in the varnish reacts with the iron container to become black after it meets water.
2. Turpentine oil easily produces reddish brown pigment in iron drums.
3, gold and silver powder and varnish are prone to acid etching, making the paint color green, dark, tarnish.
4, the storage period is too long, the sediment is discolored.
The prevention and control method is:
1. For the shellac varnish which is most prone to discoloration, it is packed in a non-metallic container.
2. Add gold powder and silver powder before using varnish. Do not prematurely add it to varnish for storage.
3. For coatings with discoloration, if it is not a quality problem, it can be used after thorough stirring.
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