I made up some Moersch easylith (1:25) for my first ever lith session last week and pulled 2 prints after letting a sheet of ordinary exposed MGRC go black to "season" the developer. The used developer didn't change colour and remains looking exactly the same in the storage bottles.

Q1. can I reuse this developer again, and for how long/what capacity
Q2 I thought used lith developer was "old brown". How long does it take to go brown, or is it "old brown" even if it hasn't changed colour?

Sorry if these are dumb questions!