my sheet has 2 lots from GL Biochem with a spread under a point, which is tight
#test-results 2025-07-08
Tuesday42 messages10 participantstimes are UTC
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the results in this channel skew because people test when they are suspicious. that is selection bias and it is real, someone check my working
how many lots do you need before you can say anything about a supplier
whats the lot
weigh the vial before you reconstitute. it costs nothing and catches the common failure
99 against a certificate of 96.8 is fine. the same supplier landing low four times in a row is a question
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*Medutest not the other one
is quantity testing available as a separate thing or bundled
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
i test roughly every tenth vial. it is a sampling strategy, not paranoia
the widest spread in my data is about 2.6 percentage points across five lots from one supplier, ask me again in a month
*Janoshik not the other one
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
quantity testing is usually a separate line item and it is the one worth paying for
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one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally, i think
does a bad result on one lot condemn the whole supplier
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one data point
nice result
do you test every order or sample it
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a result without a lot number and a purchase date is an anecdote with a pdf attached
underfill is more common than impurity. if you only test purity you are testing the less likely failure
weigh it first
update from 25 months ago: retested the same supplier, result came back better, logged both, ill dig out the number
is anyone tracking results over time in a way they would share
right so post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
log the boring ones
update on the earlier thing a point or two between the certificate and an independent result is inside what two labs disagree by
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm, for what its worth
how do you post a result so it is actually useful to somebody in a year
my result contradicts the supplier certificate, do i tell them
whats the worst result anyone has logged and what happened next
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test it again
thats not great
update on the earlier thing my vial assayed under label but the purity was fine, which matters more
a supplier disputing a result is rare here and it has never gone well for the supplier
which lab
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
if the vial has been through a bad transit you are testing the transit as much as the supplier
[edited]selection bias
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when did you buy it
On this day 2 years ago this channel logged 119 messages.