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From what I've learned bluing in fimetaria in Scotland collections is around 0.1%, mine were not bluing, so probably the same percentage or lower, this collection might be around 2-3%, and somehow the bluing in Dutch collections is around 45%. It's worth noting that, from research I've read, fimetara prefers horse crap in the Netherlands over cow's, so it might be substrate related.

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I have a couple of others photo collections saved since many years. In 1/1 collection from Scotland, 2/2 from UK, 1/1 from Spain I see several bluing, around 10%. In 1/1 collection from Germany there is no bluing spotted, but he also picked in a more brutal way ripping the stipes, leaving the bases that often has the visible bluing.

My first collection in this thread had more than 3% with bluing, I think about 8-10% but mostly on the mycelium as you can see here on the comparison photo with the very few libs we found. Magnify and look, there are small blue spots.

a few more specimens had bluing, but only like 5 visible higher up on the stipe. I also found one blue abort.
Last time we picked I didn't see any at all with bluing. But it was very wet conditions.
It's about the same with liberty caps in my experience. Some are bluing, most are not. So a bad potency indicator for species that don't have much psilocin, but could hide psilocybin...
However, I trust those that say fimetaria are on the weak side of the spectrum. But could be variants...

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However, after some analysis semilacreator (NL) claimed he was accidentally collecting both fimetaria and liniformans not regularly checking for the distinguishing feature...So it might be that liniformans stains blue more often. In collection this big, it might be liniformans present as well...So please next time check for a separable gill edge cuticle, I know you already did, but on as many as you can, especially the bluing ones...

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