Yes, but there are two bottles of 22 ml each of R-0852, as can bee seen here. As rtkane said it is 0.5 ml of R-0851 and 1.0 ml of R-0852, as can be seen here, so 44 tests (+-1).
Depending on other factors, like PH, fiberglass starts to stain somewhere around 0.1 to 0.2 ppm of iron. It will stain at lower iron levels when PH is high, and only at higher iron levels when PH is low.
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