I decant HC-110 into 4oz amber bottles as soon as I open a new bottle. Then mix from one 4oz until empty. My syrup changes color a little, looking more orange with age, but results are consistent every time. I use dil. H usually.
I feel like a dummy for not knowing this but, the last time I wanted to develop some photo paper, size 4X5, my last Ilford paper developer had died. In a quandary as what to do, I thought ‘hey, why not try try the HC-110’ so I mixed dil. B and it worked just fine. I developed 12 sheets of paper in a small tray with about 8oz of solution and it wasn’t slowing down noticeably on the last sheet.