Latex sometimes has a heavier ammonia smell while at other times it is a little milder.why?

Cementex imports latex directly from several sources in the Far East. Sometimes the latex gets contaminated by bacteria. Since ammonia is used not only as a preservative, but also as a fungicide, the stronger smell indicates that more was needed to combat bacterial action.

You may also notice a reduction in viscosity associated with the additional ammonia. More.

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