Paul, I was the dream. bgs ----- Original Message ----- From: "Paul Roark" <paul.roark@...> To: <DigitalBlackandWhiteThePrint@yahoogroups.com> Sent: Thursday, March 11, 2004 7:25 PM Subject: RE: [Digital BW] Re: Acidic Silver Prints? -- Update >...wonder if you wear a white lab robe all day ... Just part of the day. > with safety goggles Unfortunately, I now need reading glasses, but they double as the safety goggles. > and a slide rule in your pocket. Certainly not! I have a calculator-watch in my pocket (with a little LED light attached)! >It's alive it's alive! The world is probably lucky genetic engineering was not taught in colleges when I was there. My brother and I used to have a game of dreaming up the most outrageous inter-species mutants! :-) Paul www.PaulRoark.com ___________________ --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" <paul.roark@v...> wrote: > Ernst, > > Ammonia is very alkaline, with a pH of close to 12. It is used in a number > of de-acidification procedures. See, for example, > > http://www.kb.nl/kb/resources/frameset_kb.html?/kb/cons/leather/chapter5.htm > l > > The problem they note there is that some dyes and pigments might be > discolored. Whether the images we deal with would be so affected needs to > be tested. > > The reactions in the URL you cited seem to require UV light and pollutants > in the air that causes a reaction that forms acidic NOx. > > Again, however, I'm not a chemist. In my experiments what I see is that > acidic paper put in a bag with a cap half full of ammonia becomes alkaline > very quickly, according to my acid test pen. > > As to the fade testing of Ultima, the first sample was the wrong paper. > I've just received the correct paper and will try to get a comparative fade > test going early next week. Then it'll be another month before it runs long > enough to start seeing any significant results. > > Paul > www.PaulRoark.com > > ____________________________ > > -----Original Message----- > From: Ernst Dinkla [mailto:E.Dinkla@c...] > Sent: Thursday, March 11, 2004 11:16 AM > To: DigitalBlackandWhiteThePrint@yahoogroups.com > Subject: Re: [Digital BW] Acidic Silver Prints? -- Update > > Paul Roark wrote: > > > > With inkjet prints there have been stories from Florida of very rapid > > deterioration of Epson Enhanced Matte prints. Presumably the heat and > > humidity in Florida accelerates the acidic attack on the paper. > > > I think if I had an important print that was dry mounted on acidic board > I'd > > first de-acidify it in a bag with ammonia for about 20 minutes. Then I'd > > use the Wei To product on the back and hope that the dry-mount tissue > > stopped the product from reaching the print. > > Remembering some ecological disputes about cow dung creating > ammoniac gases in the air and the resultant acids when ammoniac > gases are exposed to light I wonder whether that treatment will > no worsen the archival qualities. Could be just a local Dutch > problem of course :-) Similar thoughts are expressed here: > > http://www.usask.ca/lists/alt-photo-process/1996/alt96b/0757.html > > I think ammonia only reacts with UV light but I could be wrong. > > I think buffering in the paper itself is the most important thing. > > BTW, Paul any sign of fading on the Kodak Ultima paper yet ? > > Ernst > > > > Please visit the Group Homepage to check the Files, and other resources as > they are often being updated. > > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint > > If you wish to receive no emails or just a daily digest, or you wish to > unsubscribe, please edit your Membership preferences by visiting this same > page. > > Please follow these basic guidelines: > - As threads develop, trim off excess portions of earlier messages to keep > them short. > - Good manners are required at all time. No personal attacks or flames. > Hostile, aggressive or argumentative users may be removed from the > membership without notice. > - Keep your posts and threads related to the group topic of digital B&W > printing. Users who persistently make off-topic posts may be removed from > the membership. > - By posting on this forum you agree to abide by the group rules and > guidelines, and to abide by the actions and decisions of the group Owner and > Moderators. See Group Topic, Rules and Guidelines in the Files section: > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/ > > BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT > YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE OWNER AND > MODERATORS OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO YOU > FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR EXEMPLARY > DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFITS, > GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE OWNER AND > MODERATORS OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN ADVISED OF THE > POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY > TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii) UNAUTHORIZED ACCESS TO OR > ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF ANY > THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) ANY OTHER > MATTER RELATING TO THE DIGITAL BW, THE PRINT YAHOO GROUP. > > Yahoo! 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Re: [Digital BW] Re: Acidic Silver Prints? -- Update
2004-03-12 by bgs