What causes the black dot in the viewing tube of a CYA test to disappear? Is it a chemical reaction that turns the black dot to white OR does the cloudiness of the test solution seemingly make the dot "disappear"?
Sandy
Black dot in CYA test
What causes the black dot in the viewing tube of a CYA test to disappear? Is it a chemical reaction that turns the black dot to white OR does the cloudiness of the test solution seemingly make the dot "disappear"?
Sandy
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