PRE-6 Document version: common (details shared among variations)
Object Class: Safe
I'm going to point out the obvious other antimeme which I think this SCP draws a lot of inspiration from, SCP-055, which is Keter. Because of the lack of information on this object and the fact that nobody post-6 minutes can view it at all, I believe this should at least be Euclid status.
a very powerful perception-altering effect
I dislike the word "powerful" being used here. I would change it to potent. At the very least, I would remove the word "very". It comes off as non-clinical.
Addenda
The way you've assigned the documents was confusing to me on the first read. I understand now, upon inspection, that you've chosen each document to have its own independent A-Z suffix. When I first read it I thought "why does it go B,D,C?" Consider changing the testing logs to have numerical designations, rather than alphabetical ones.
Experiment Log 2MIN-B
Unless I'm missing something, the timestamps are wrong. He's only in there for 40 seconds before he passes the six-minute threshold. Also, I'm unable to close the collapsible which confused me further. Even a few seconds of confusion are wasting those valuable six minutes that you've given the reader.
Class-Y mnestic
Consider taking this out of the PRE-6 versions. If the reader clicks on the crosslink, they're going to eat up their 6 minutes which isn't going to make them happy.
So here I am, Dr Greaves, vigilante researcher
This makes the Foundation seem incompetent. Did they just let him waltz into a secure location with mnestics?
The second perception is whatever memory SCP-2MIN injects over itself
While the first and third perception makes sense, this one doesn't. To me, perception is using the senses which doesn't include memory. I'd call it a three-tier antimemetic effect. The first tier (zero-th tier?) is what is actually is, second-tier is it alters your memory and the third tier is you can't perceive it at all.
walking through ketchup
Nothing wrong with this just wanted to point out that I really like the imagery here.
if it's just me forgetting how
I thought mnestics made you remember things, not forget? How is the researcher forgetting how to breathe?
PRE-6 Document version: 0 (Red Cube)
Small
I know this is nitpicky, but small is relative.
reflects light perfectly
Then it wouldn't be red, it would be white.
when photographed it appears to do so
This is really confusing. So, it's white when you photograph it, but red when you look at it?
PRE-6 Document version: 1 (Woman)
test was deemed 'impolite'
You don't need the quote marks here.
A single undefined vocalisation from SCP-2MIN
Just noting that no other document versions have this extra note.
PRE-6 Document version: 2 (Puce)
This entire concept of a region of space being "puce" is just strange to me. Not bad strange, just weird strange. It doesn't make sense to me. Maybe that was your intention, but it's the only version of the document where the manifestation of 2MIN isn't an actual object.
PRE-6 Document version: 3 (Pigeon)
subjects describe it as 'being frozen in time'
I think this is unnecessarily. I got that from the description and comes off as non-clinical.
Empirical data
There's nothing here. I think you missed this.
'Changes' into something else
No need for scare quotes here.
Experiment Log 2MIN-D
Unless I'm missing something again, timestamps are incorrect in this document.
Why hasn't anyone come to get me? Is it because I'm in the cell, but the cell is empty?
There seems to be an extra sentence here than in every other version of the document. He doesn't say anything about SCP-2MIN in this line, so why the sudden extra sentence?