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[Bjune]

A 0 total residual solvent reading is valid?

[SHQuality]

It would help to have some background on the situation, but in my book the only test results that can read 0 are certain microbiological tests like Salmonella and Listeria (Absent in 25g).

 

When you're measuring amounts of residual solvent, there will always be a limit of detection and a limit of quantification that is going to limit your lowest possible reading to something higher than 0. So at first glance, a reading like this would register as suspicious to me.