But for the watermark detection in great. You can find it as hexane, as lighter fuel, in many other shapes (i've bought the last small bottle in a farmacy as patches removal liquid!?). I'm not a chemist, but i have no problem using the two/three product needed to treat paper. The Morely-Bright replacement sachets are really really difficult to find. I don't know if it is by chance or what, but I've never run into this problem on used stamps. I have also read reports that lighter fluid will cause some cancel inks to "run". I've never seen a footnote on stamps that cannot be soaked in lighter fluid, but from what I understand, it only occurred on an ink used on a few engraved stamps. In the Scott catalog, some (not all) will be footnoted with "aniline ink" for those that should not be soaked in water. There are a very small number of stamps that do not mix well with lighter fluid nor water because of the ink used in printing. Ronsonol will be safe on almost all stamps you encounter. Most of those because cancellations interfere with the quick methods, although some of those post-1950s British Commonwealth watermarks can be really faint as well. The remaining <10% end up having to use Ronsonol. Those I can't see, I hold up one by one several inches in front of a light source and look through the back of the stamp. Half my watermarks I can ID quickly wearing dark blue jeans and laying the stamp down on my lap (don't use bright lighting, just nominal lighting). In my experience, I've only had to use Ronsonol on less than 10% of watermarked stamps. If really concerned, just make sure you buy filtered lighter fluid (it's more expensive). I'm still using bottles from years past, so I can't confirm there is a problem with "oily" residue or "stuff" in the recent Ronsonol. Someone mentioned that the bottled Ronsonol in the past couple of years is not as "clean" as in the past, so they "filter" the Ronsonol before using. That will reveal most watermarks except some of those light yellow or orange-yellow stamps with a dark cancel "in the wrong place".
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