Years ago, I used Carbon tetrachloride, sold cheaply as a spot remover under the trade name Csrbona, for watermark detection. It was dangerous carcinogen and has since been removed from the market. Ronsonal works well with the exception of a few European stams where it re dissolves the ink. Most dealers I know use Ronsonal.
I got one quart so far from paint dept as refill for my emptied Ronsonol; it is not dirtier than what came in Ronsonol. I suspect talk of dirtier naphtha is really a matter of random minor contamination, perhaps more likely from some sources, or was more likely in the past?
Hi all; it seems that the main point would be that the product Ronsonol made by Zippo after 2010 has a composition of 70% light hydrotreated distillates with 30% hydrotreated light naphtha. the straight hydrotreated naphtha (Klean-Strip VM&P) is 95% from the paint store, heavy and oily from the other aliphatic hydrocarbons c7-c9, and many others. my summation would be for the lighter fluid as the lighter solvents will have less impact on the physical aspects of the stamp papers. faster evaporation is a plus for clue to better solvents, but way more flammable. safety first always.