Bleaching with colored urea solution
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Our company produces some colored urea. The main problem is that colored urine appears during the switching process, and it cannot be used when producing white urea or urea in other colors. I would like to ask those who are knowledgeable: what bleaching agents can be used to bleach it? The bleaching agents in question must not contain chloride ions or sulfate ions.
What you produce is urea containing pigments, so it cannot be bleached.
The pigment can be added at the outlet of the melt pump. Then there will be no difficulty in dealing with urine during replacement.