Archived posting to the Leica Users Group, 2002/01/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Rei, the only sure test would be to create a test strip much as the commercial labs use. First frame blank, second frame gray card exposed per the meter, third frame minus three stops, fourth frame at plus five stops. To make this work you would have to create a standard set to compare with known good chemistry or from a well set up commercial lab that runs commercial test strips. The first frame tells you if your fix is any good or whether there is some source of dichroic fog in the system. The third frame tells you the speed point of the process. This needs to be looked at in conjunction with contrast as if this point rises as well as the middle gray then contrast stays the same but everything is overdeveloped or the fix is going south which you can tell from the blank frame. The second frame minus the third frame tells you the contrast index of your system. If the developer is just going south you will see it in the contrast assuming the FB + fog stays constant. The fifth frame indicates ability to create dMax, this would be important if you were experimenting with higher dilutions. All of the above implies the possession of a densitomiter or access to one. E-mail me if you have any questions. Don Dory dorysrus@mindspring.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html