Final answer:
When you have used ammonium thiosulfate, you should avoid applying substances that can interfere with the oxidation process of colloidal sulfur or unfavorably alter soil conditions. The specifics can vary based on context but typically involve avoiding chemicals that react negatively with ammonium or sulfur compounds.
Step-by-step explanation:
If you have previously had ammonium thiosulfate, which contains ammonium thiosulfate (NH4)2S2O3, you should be cautious about applying certain products or chemicals to the same area or context. Ammonium thiosulfate, when applied to soil, forms colloidal sulfur (S°) and ammonium sulfate ((NH4)2SO4), where the colloidal sulfur must be oxidized to be useful for plant nutrition. This process can influence the soil pH and can interact with other applications. Thus, it's important not to apply substances that could react negatively or could interfere with the oxidation process of the colloidal sulfur.
In the agricultural context, for example, one wouldn't apply substances that could alter the soil conditions unfavorably or inhibit the microbial activity necessary for the oxidation of sulfur. Details regarding specific chemicals to avoid would depend on the context of the question, as some are agricultural and others might pertain to personal care (such as in hair treatments).