RE: Mike Ware's POP Pt./Pd. Pt
Sandy, May I ask if you can quote a log density value for your DMAX? Sorry if I missed this. Thanks, Don Bryant -----Original Message----- From: Sandy King [mailto:sanking@clemson.edu] Sent: Friday, November 10, 2006 5:52 PM To: alt-photo-process-l@usask.ca Subject: RE: Mike Ware's POP Pt./Pd. Pt Loris, It appears that the white, irregular spots I described earlier resulted from using too little of the sensitizing solution. With this method the paper seems to need about 20-25% more solution than with DOP Pt./Pd. In any event I increased the amount of solution for the coating area, and added a few drops of a surfactant, and today made four very nice 12X17" prints with the Ware POP method, with no irregular spots. I am very pleased with the good Dmax I am getting with this method at RH of about 55%, and the color of the prints is a nice warm sepia, not unlike what you get with warm potassium oxalate in DOP. Sandy King At 8:35 AM +0200 11/10/06, Loris Medici wrote: >Hi Sandy, > >What is your coating / drying procedure? > >-----Original Message----- >From: Sandy King [mailto:sanking@clemson.edu] >Sent: 10 Kasžm 2006 Cuma 08:23 >To: alt-photo-process-l@usask.ca >Subject: RE: Mike Ware's POP Pt./Pd. Pt > > >One issue I have seen with a few of the AFO >PT./Pd. is small white spots, irregular in shape >and some larger than others, and all in the >shadows and lower mid-tones. I suspect that they >may be caused by the sensitizer separating from >the paper during exposure, or more likely when >the negative is separated from the paper after >exposure, perhaps due to moisture content. I use >a vacuum frame and the pressure, even though not >great, may cause the separation. With FO Pt./PD I >typically dry the coated paper only about fifteen >minutes and have never had this kind of issue. >With the POP process I am finding that there is >some risk of the white spots unless drying times >are much longer. As I mentioned earlier, I am >working in a room with RH of about 50-55%. > >Of course, the problem might be something else, >such as something in the sensitizer or method of >coating. I am very new to this method of printing >and still trying to learn to recognizes the cause >of problems.
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