SCP-XXXX is to be kept in a refrigerator maintained at a temperature of 3 degrees Celsius.
Why that specific? Any standard fridge can keep bread edible.
Personnel of a Level 1 security clearance or higher may perform tests on SCP-XXXX.
This means that any personnel who are allowed to interact with an SCP object can perform tests, and as such, it's kind of redundant.
whole wheat loaf of bread, measuring 28.5 cm long, and cut into 1.5 cm slices, with little to no imperfections.
The commas here aren't necessary. Also, it's "few to no" imperfections since imperfections are units.
instance/instances of SCP-XXXX-2 is taken
unless in a direct line of sight, which includes video monitoring.
This is kind of clunky — I'd write it as "unless in direct observation by personnel or recording devices"
counterparts, (Which includes yeast, water, whole wheat flour, etc.), which
Just say "counterparts (such as yeast, water, flour, etc.), which ".
are taken except the heel
There are two heels on any given loaf of bread — is this different for this loaf? I'd personally have both heels have this property if not eaten, and as such you could have ~30 some loaves, all with different bread types. Kind of like a bread buffet, especially if some are the more exotic or nourishing types of bread, like raisin, pumpkin, or honey. I can see that revolutionizing Foundation sandwiches for decades.
the bread type will change
If the type changes, then "SCP-XXXX is a ██████ brand whole wheat loaf of bread" should probably have a "currently" in it.
Subject is provided with sheets of cardboard, varying in size and shape, and a set of instructions. Subject starts assembling the structure explained on the instruction sheet provided.
The subject should probably just be provided with the structure, as watching a D-Class relive their experiences with IKEA wouldn't tell the observing researchers anything, aside, perhaps, from the irritation threshold of the D-Class in question.
flow of SCP-XXXX-2 spewed
"Spewed" is an informal word, and slightly redundant in this context.
were 2 months ago
began 7 months ago
As this is a relative time measure, I'd just say "they were when their testing began" as you did in the previous log. In fact, the whole aging thing could just be said in the description as "SCP-XXXX does not appear to age or grow stale."
it is advised that only D-Class consume SCP-XXXX-2 instances.
Given the large amount of SCP objects and products which are consumed by Foundation personnel (chips, drinks, donuts, etc), I see no reason why SCP-XXXX would be no different.
Proposal is currently awaiting the approval of O5-█.
O5 has more important things to worry about — this would be the Site Director's decision.
As a final summary, it's definitely not interesting enough to be an SCP. However, if it was pruned a bit, it could be a stellar entry in the Log of Anomalous Objects, especially if both heels could regenerate a different loaf. Hell, if you wanted, you could even have some messages from other sites requesting their own loaves for their own mess halls. All in all, put this thing on the Log.