certificate said 99.4 and the independent came back 97.4, is that a problem
#test-results 2024-09-07
Saturday41 messages11 participantstimes are UTC
Highlights from this day
- customs_owl — if the vial has been through a bad transit you are testing the transit as much as the supplier 22:35
- noct.titrate — i test roughly every tenth vial. it is a sampling strategy, not paranoia, anyway 22:51
- VialBot — Digest for the week of 2024-05-08 has been published. 23:24
- HPLC_Hank — update from 8 months ago: retested the same supplier, result came back better, logged both, thats one data point underfill is more common than impurity. if you only… 23:31
how much does sample handling on my end affect the number
whats the lot
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a point or two between the certificate and an independent result is inside what two labs disagree by, anyway
if the vial has been through a bad transit you are testing the transit as much as the supplier
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgthe results in this channel skew because people test when they are suspicious. that is selection bias and it is real
right so anyone had a result they think was a lab error rather than a bad vial
selection bias
whats the worst result anyone has logged and what happened next
[redacted at member request] · archive policy
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which lab
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how many lots do you need before you can say anything about a supplier
my result contradicts the supplier certificate, do i tell them
99 against a certificate of 96.8 is fine. the same supplier landing low four times in a row is a question
i test roughly every tenth vial. it is a sampling strategy, not paranoia, anyway
quantity testing is usually a separate line item and it is the one worth paying for
a result without a lot number and a purchase date is an anecdote with a pdf attached
weigh it first
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log the lot number
is a purity-only test worth the money if underfill is the common failure
coming back after 24 months with a follow up result, where do i put it
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally, not advice obviously
has a supplier ever disputed a result posted here
weigh the vial before you reconstitute. it costs nothing and catches the common failure
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
i had a result i am fairly sure was a handling error on my side and i logged it as such
posting my Janoshik result on lot G-0641, what do people make of it
[edited]thats a fill problem
Digest for the week of 2024-05-08 has been published.
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thats within range
is it worth testing if the vial has already been through a warm transit
update from 8 months ago: retested the same supplier, result came back better, logged both, thats one data point
underfill is more common than impurity. if you only test purity you are testing the less likely failure
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*VendorInvestigate not the other one
underfill is more common than impurity. if you only test purity you are testing the less likely failure
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later, thats one data point
do the results in this channel skew because people test when suspicious
nice result
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
log the boring results too. a channel that only records failures produces a false picture
does a bad result on one lot condemn the whole supplier