Practice · Storage & stability · continued

Power cut for eleven hours: how I assessed it afterwards posts 61–90

Practice › Storage & stability beyond-use date freeze-thaw storage cloudy or discoloured solution

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

c.adebayoTL217 Sep 2025#61

k.ogunleye, post #4: Coming back to post #2, because the follow-up matters more than the original answer. Marking my uncertainty on power cut for eleven hours explicitly. I am confident about the direction, much less confident about the size, and not confident at all that it generalises past the case in the first post. Go to post

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

Flagging that the sources on this are thinner than the confidence in the thread suggests.

9 likes in reply to #4 10mo

z.yildizTL218 Sep 2025#62

Temperature excursions in transit are common and are not all equal. A few hours warm is a different event from three days warm, and neither is visible in the vial on arrival.

Adding a source would improve this post and I do not have one to hand.

21 likes 10mo

l.trevinoTL219 Sep 2025#63

Bookmarking this. I will come back when I have something worth adding.

0 likes 10mo

h.karlsenTL220 Sep 2025#64

I read post #61 twice before replying, because I had assumed the opposite.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

2 likes 10mo

n.vogelTL221 Sep 2025 · edited#65

Taking post #62 at face value and following it one step further.

Worth separating power cut for eleven hours as a question about the compound from power cut for eleven hours as a question about the documentation. They get answered by different people and only one of them is answerable here.

6 likes 10mo

e.okaforTL221 Sep 2025#66

Small correction to my own earlier position on power cut for eleven hours. I had the units the wrong way round, which changes the conclusion by an order of magnitude and therefore changes it entirely.

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s.ferreiraTL222 Sep 2025#67

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

That distinction has done more work for me than anything else in this category.

0 likes 10mo

o.cousineauTL3Regular23 Sep 2025#68

Wickramasinghe, post #49: Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. On balance I think that is right, and I would not bet much on it. Go to post

I would put moderate confidence on the mainstream reading of power cut for eleven hours and no more. That is not scepticism for its own sake; it is where the sourcing actually stops.

1 like in reply to #49 10mo

system_suitabilityTL3Analytical chemist24 Sep 2025#69

On power cut for eleven hours: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than any reply here including this one.

3 likes 10mo

n.ibarraTL225 Sep 2025#70

Right — I had this wrong and I am glad to have read it before it mattered.

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sharps_binTL225 Sep 2025#71

Collapsed as off-topic by two members at trust level 3 or above

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

The interesting part of this is the exception, and I do not understand the exception.

i.boatengTL226 Sep 2025#72

Power cut for eleven hours is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at.

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outline_firstTL3Wiki editor27 Sep 2025#73

Understood. Thank you for being specific about the limits of it.

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se.okaforTL228 Sep 2025#74

Post #72 answers the question as asked. The question underneath it is different.

Having read the whole power cut for eleven hours thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby one instead.

14 likes 10mo

cannula_traceTL3Regular29 Sep 2025#75

SHermansen, post #3: Marking my place. If it changes for me I will come back and say so. Go to post

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

8 likes in reply to #3 10mo

j.restrepoTL229 Sep 2025#76

c.adebayo, post #61: Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. Flagging that the sources on this are thinner than the confidence in the thread suggests. Go to post

Building on post #75 rather than restating it.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

2 likes in reply to #61 10mo

c.wijnbergTL2Member30 Sep 2025#77

Everything in post #75 holds. The case it does not cover is the one I have.

An update on my earlier power cut for eleven hours post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.

0 likes 10mo

da.bakkerTL21 Oct 2025#78

Power cut for eleven hours sits at the boundary between what this community can usefully discuss and what it cannot, and I think it falls on the discussable side, narrowly.

20 likes 10mo

lc_gradientTL3Analytical chemist2 Oct 2025#79

Where I part company with post #75, and it is a narrow parting.

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

0 likes 10mo

s.okaforTL22 Oct 2025#80

outline_first, post #73: Understood. Thank you for being specific about the limits of it. Go to post

Adding a null result on power cut for eleven hours. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.

0 likes in reply to #73 10mo

PSkarbekTL3Regular3 Oct 2025#81

s.okafor, post #80: Adding a null result on power cut for eleven hours. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are. Go to post

Careful with the language on power cut for eleven hours. "Not detected" and "not present" are different findings and the first is a statement about the method.

3 likes in reply to #80 10mo

t.abubakarTL24 Oct 2025#82

I had written a reply contradicting post #78 and deleted it. Here is what survived.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

It cost nothing to check and would have cost something not to.

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v.krastevTL25 Oct 2025#83

Adding a note of thanks rather than an opinion. I did not know most of that.

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m.achebeTL26 Oct 2025#84

j.cabrera, post #55: The failure mode on power cut for eleven hours is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong. Go to post

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

0 likes in reply to #55 10mo

excursion_checkTL3Regular6 Oct 2025#85

Post #84 is right about the mechanism and I think understates the practical bit.

I would keep power cut for eleven hours and the decision it usually gets used for separate in this thread. They are related and they are not the same question, and merging them is why the last one went badly.

6 likes 10mo

a.hartmannTL27 Oct 2025#86

Collapsed as off-topic by two members at trust level 3 or above

Coming back to post #82, because the follow-up matters more than the original answer.

Power cut for eleven hours looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.

buffer_marginTL3Regular8 Oct 2025#87

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

32 likes 10mo

k.haddadTL29 Oct 2025#88

s.ferreira, post #67: Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. That distinction has done more work for me than anything else in this category. Go to post

The practical version of power cut for eleven hours is three sentences long. The rigorous version is three pages and reaches the same conclusion with the conditions attached.

0 likes in reply to #67 10mo

v.sjobergTL29 Oct 2025#89

One caution on power cut for eleven hours: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and is rarely stated.

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t.vasquezTL4 Moderator10 Oct 2025#90

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

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