my vial assayed under label but the purity was fine, which matters more
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#test-results 2025-10-08
Wednesday27 messages5 participantstimes are UTC
Highlights from this day
- void_volume — update from 14 months ago: retested the same supplier, result came back better, logged both sample handling on your end absolutely affects it. draw cleanly, ship… 22:35
- void_volume — log the boring results too. a channel that only records failures produces a false picture 22:38
- area_percent — while im here if the vial has been through a bad transit you are testing the transit as much as the supplier, n of 1 obviously 22:48
- void_volume — my sheet has 8 lots from QST with a spread under a point, which is tight 23:21
- void_volume — is a purity-only test worth the money if underfill is the common failure a result without a lot number and a purchase date is an anecdote with a pdf attached 23:30
log the boring ones
weigh the vial before you reconstitute. it costs nothing and catches the common failure
i have never regretted spending the money on a test. i have regretted not testing twice
how do you separate batch variance from supplier variance
certificate said 99 and the independent came back 97.4, is that a problem
a result without a lot number and a purchase date is an anecdote with a pdf attached
quantity testing is usually a separate line item and it is the one worth paying for
unrelated but the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
[redacted at member request] · archive policy
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update from 14 months ago: retested the same supplier, result came back better, logged both
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
log the boring results too. a channel that only records failures produces a false picture
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a single sample tells you about a single vial. that is genuinely all it tells you
thats not great
while im here if the vial has been through a bad transit you are testing the transit as much as the supplier, n of 1 obviously
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i had a result i am fairly sure was a handling error on my side and i logged it as such
nice result
if you are testing to settle an argument you will not settle it with n of 1
is quantity testing available as a separate thing or bundled
for the archive sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
how many lots do you need before you can say anything about a supplier
i test roughly every tenth vial. it is a sampling strategy, not paranoia
a single sample tells you about a single vial. that is genuinely all it tells you
my sheet has 8 lots from QST with a spread under a point, which is tight
is a purity-only test worth the money if underfill is the common failure
a result without a lot number and a purchase date is an anecdote with a pdf attached
test it again
has a supplier ever disputed a result posted here