Archived posting to the Leica Users Group, 2004/10/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]the fungus makes hydroflouric acid that etches glass see John van Stelton's site: http://www.focalpointlens.com/fp_intro.html Dennis Dan Post wrote: > That sounds like the infamous 'fungus damage' one hears about- while I > am not a mycologist by any means, I seem to have read that the lichen > that grows on rock, and slowly breaks it down , is a symbiotic relation > between a fungus and an algae. I would not be surprised if the fungal > myceliium threading through the organic oils on a lens were to release > an acid that etched the glass. If many rocks are basically silicates of > one form or another, I am sure the highly refined silicas in Leitz > oprical glass are a gourmet delight to any enterprising fungus! Yum! > Dan