recycling developer

[boochap]

if u recycle developer, how many % of minutes do u add for each recycling?

i am going to use DD-X at 1+4 standard dilution for HP5 film at ISO400. fresh 1+4 DD-X will need 7mins at 24degc.

sorry, this sound like i am such a newbie. i've not been dev for last 7mths, all forgotten.

thanks.

[sweat100]

I have recycled for D76. Not sure if it will work for DD-X.
For 1+1 using D76 I did not add new solution to it. I was able to develop 8 sheets of 4x5, 2 rolls of 135 (36 exp each), 2 rolls of 120 in 1.6 litres of dilution solution (and still using the solution). The results were quite consistent. I keep my chemicals is accordian bottles after developing to minimise oxidation and light from entering. I think you can experiment to see when will the developer exhaust but at the expense of some thin negatives at the end of the last roll.
But of course if you can, try to use new chemicals for every new processing many as pointed out. YMMV.

[enivre]

If I'm not wrong it's 10% extra time, for each time you reuse the developer.

But that's a ballpark figure, and for me it was written on the box of developer and I just followed it. Didn't notice any problems but I wouldn't go so far as to use it more than 3 times max. (I used it twice then discarded)

[Tachi]

I'm using Tmax developer (1+4), add 30secs for each re-use. But I limit it to 3 times or 1 month from date of mixing.

[enivre]

Originally Posted by Tachi I'm using Tmax developer (1+4), add 30secs for each re-use. But I limit it to 3 times or 1 month from date of mixing.

1mth? Wow... I thought when mixed it should be used within 24hrs?

[boochap]

Originally Posted by Tachi I'm using Tmax developer (1+4), add 30secs for each re-use. But I limit it to 3 times or 1 month from date of mixing.

what was the normal processing time with fresh dev??

[Tachi]

For Tmax 400, developing time is 6min 45sec @ 20degC, agitation 4 inversion per 30 sec, using a 8oz stainless steel tank.