[tkbpm61]

So is anyone able help me out with identifying what reaction occurs between Gluconic acid C6H12O7, water and Sulfamic acid H3NSO. Gluconic acid is a slightly yellow color on its own and sulfamic is clear when mixed with water. I mixed small amounts together and over the course of 48 hours the solution gradually darkened to a color similar to an iodine halide. The pH has remained the same over time.

Proportions used were 100g Gluconic acid 25 g DI water and 5 grams sulfamic acid initial pH .98

[billnotgatez]

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Gluconic acid
https://en.wikipedia.org/wiki/Gluconic_acid
C₆H₁₂O₇


Sulfamic acid
https://en.wikipedia.org/wiki/Sulfamic_acid
H₃NSO₃