a supplier disputing a result is rare here and it has never gone well for the supplier
96.8 against a certificate of 99.4 is fine. the same supplier landing low four times in a row is a question
#test-results 2026-02-10
Tuesday23 messages6 participantstimes are UTC
Highlights from this day
- VialBot — New independent result logged — SGN, lot D-0718, purity 97.4% (Janoshik). 15:20
- VialBot — Inter-lab diff for lot A-2418: 98.6% vs 99.4%. Within expected range. 16:01
- tb500_tobias — one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally, anyway 16:45
- u100_pat — log the boring results too. a channel that only records failures produces a false picture 16:48
- declared_value — anyone tested the same lot twice at different labs 18:20
a single sample tells you about a single vial. that is genuinely all it tells you
follow up a result without a lot number and a purchase date is an anecdote with a pdf attached
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quick one if the vial has been through a bad transit you are testing the transit as much as the supplier
nice result
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
thats not great
New independent result logged — SGN, lot D-0718, purity 97.4% (Janoshik).
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
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Inter-lab diff for lot A-2418: 98.6% vs 99.4%. Within expected range.
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whats the underfill rate people are actually seeing
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally, anyway
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attach the pdf
log the boring results too. a channel that only records failures produces a false picture
| Evidence | Counts? |
|---|---|
| Independent report, lot you bought, lot number legible | yes |
| Independent report, no lot number | no |
| Supplier certificate only | no |
| Screenshot of a report | no |
| Blinded pooled submission | yes, for the pool |
| A friend who said it was fine | no |
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
my vial assayed under label but the purity was fine, which matters more
anyone tested the same lot twice at different labs
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coming back to this weigh the vial before you reconstitute. it costs nothing and catches the common failure, take that with a pinch of salt
quantity testing is usually a separate line item and it is the one worth paying for
do you test every order or sample it
posting my Janoshik result on lot B-0329, what do people make of it