the dedicated replenisher.
You reminded me, I have some
Has a little bit remaining. I used it direct (diluted) and it worked fine. Can't remember last time but maybe a couple of years ago. Might throw some old film at it for science and a laugh!
Whilst digging that out, I found this...
Now this is old! Looks to be enough for a few films @ 1:100. Another experiment not worth doing but I will!
I do have a bottle of newer HC110 which I haven't opened yet... it's dated 2020
Also unearthed 2 bottle of Agfa Viradon which I've been keeping for a rainy day!
And finally.. on developer longevity, I bought a 5L 'bottle' of Tetenal Eukobrom paper developer many years ago and last night diluted some, and got very little development, so poured some more into the tray... still not much... tipped that out and pour some more into the tray 'neat' Took 6mins in developer and still not great! So, I have a bout 3L left

I have successfully used this not long ago (months) so it's fallen of the cliff somewhat suddenly.