Digest for the week of 2025-03-27 has been published.
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#test-results 2026-01-15
Thursday26 messages8 participantstimes are UTC
Highlights from this day
- assay_not_purity — a supplier disputing a result is rare here and it has never gone well for the supplier, ask me again in a month 22:25
- plus_sixteen — sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm 22:28
- ferrous_ash — anyone tested the same lot twice at different labs 22:34
- rotterdam_recon — do you test every order or sample it 23:00
a supplier disputing a result is rare here and it has never gone well for the supplier, ask me again in a month
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sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
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i test roughly every tenth vial. it is a sampling strategy, not paranoia
quantity testing is usually a separate line item and it is the one worth paying for
when did you buy it
anyone tested the same lot twice at different labs
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if the vial has been through a bad transit you are testing the transit as much as the supplier
has a supplier ever disputed a result posted here
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ok so the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
log the boring results too. a channel that only records failures produces a false picture
test it again
if you are testing to settle an argument you will not settle it with n of 1
do you test every order or sample it
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certificate said 97.4 and the independent came back 99, is that a problem
my sheet has 4 lots from FGP with a spread under a point, which is tight
nice result
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
slightly off topic but the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
right so how do you post a result so it is actually useful to somebody in a year
weigh it first
a point or two between the certificate and an independent result is inside what two labs disagree by
selection bias
while im here how many lots do you need before you can say anything about a supplier
does a bad result on one lot condemn the whole supplier