Up to now, I have been using Ilford Multigrade developer to develop my prints. However, last week I saw some Harman / Ilford Warmtone developer in a shop and wanted to give it a try. However, reading the instruction sheet that came with the developer, it states that working strength (1:9 diluted that is) can only be kept for "up to 24 hours" even when in a "tightly capped bottle".
Is this true, and what is the reason why working strength WT / CT developers can not be kept?
It seems like a big waist of developer... and can one apply replenishing? (remove 100cc / per liter and add fresh 100cc developer concentrate), instead of having to ditch 2 liters of developer each day???