Hi all, Although I have been printing B/W images for a few years now, I have only recently begun to explore the possibilities of toning. I have succesfully done several sepia tonings, and recently (a few months ago) decided to buy some selenium toner (Amaloco T-60) to test it. With sepia toning, it is quite obvious when the toner get's exhausted, with increased toning times simply judged by the very visible color change. Now with selenium toning, things aren't so obvious... Some papers and dilutions, simply have almost no visible changes at all, made even more difficult if for example split sepia / selenium toning is applied. After the image has been partially sepia toned (removed quickly from bleach to leave metallic silver), a change in the selenium toning bath may not visible at all. Of course, in this case you're only left with the archival effect of the selenium toning (which is actually the main reason I wanted to selenium tone...). So how do you people judge if your selenium tonings have been successful, and if the toning bath is still active??? This has been bothering me recently and to do some kind of test, I recently tried the following: - Made some test strips by cutting down a not yet toned print and marked them with 1,2,5 and 8 for toning times in minutes. - Dumped them in a selenium bath (1:15 dilution of stock Amaloco T-60) that I had used before and took them out of it at the designated marked times. - Rinsed - Now, to test if the selenium toner was still active, I subsequently dumped the test strips in some fresh sepia toner bleach. Much to my shock , even the 8 min test strip bleached away almost completely!!! The selenium toner at 1:15 dilution was maybe two months old... I had only used it for several prints back than, at least not above the stated capacity, and subsequently stored it in fully stoppered bottles for rest of the time, only to use it now again. By the way, throwing an "old" selenium toned print (from the first toning session two months ago) into bleach, DID withstand the bleach, so I at least know for sure the selenium toner has been active at some point of time... I now read somewhere that selenium toner has only a very limited life-time when diluted (don't know why this isn't mentioned in the instruction manual of the toner, as it IS vital with this type of toner), and that at dilutions above 1:19 it should even be considered "one time only"... Is this true?, and how do *you* judge the remaining activity of the bath??? Do more people use bleach to test if the toner is still active, or do most people indeed throw away the selenium toner after a single toning session? How many prints do you do with a certain amount of toner of your favorite brand? In short: What is the best procedure to handle selenium toner and to make sure I am actually truely toning and not doing some "phantom" procedure?