Kentmere 400 @ISO3200 in modfied Barry Thornton 2-bath developer

Kentmere 400 @ 3200

Canon EOS 3 / Carl Zeiss Vario Sonar 3.5/40-80mm

Developed two times in Barry Thorntons (BTTB) 2-bath (modified metol/hydroquinone). Why?

2-baths does an excellent job in the shadows but the developer deposited in the emulison by the 1. bath isn't sufficent to complete the job in the upper midtones highlights at N+3. Compared to a condensor, the emulsion needs to get recharged by new developer.

First pass: BTTB 2-bath

Stopbath in order to neutralize the alkaline and to positively charge the emulsion for better attraction of the negativ-charged methol/hydrochinon anions prior to second pass

Wash 3 times

Second pass: BTTB 2-bath

Final wash / Fixing

WORKS!

 

BATH A:

Metol 3,25 g/l

Hydroquinone 3,25 g/l

Sodiumsulfite 85 g/l

 

4:30 min. for low sped film

5:30 min. for high speed fil

initial inversions 5sec, then 5 sec after each minute

 

Bath B:

Sodiummetaborate

for low contrast 7g/l

for normal contrast 15 g/l

for high contrast 20 g/l

 

4:30 min. for low sped film

5:30 min. for high speed fil

initial inversions 5sec, then 5 sec after each minute

Done