Re: Lens problem - fungus??

On 21 Nov, 00:49, Paul Friday <De...@[EMAIL PROTECTED]
> wrote:
> In message <mahamantra-F8BBD2.22293115112...@[EMAIL PROTECTED]
>,
> krishnananda <mahaman...@[EMAIL PROTECTED]
> writes
>
> >Hydrofluoric acid does damage glass.
>
> And bones - never get it on your skin.
> --
> Paul Friday

It might be oxalic acid that the fungus is using. This is an organic
acid known to attack e-glass which is the glass used in glass fibre. E-
glass contains metal oxides to give it low electrical conductivity
properties (it also gives it increased strength) and optical glass
contains similar metal oxides, some of them the same. It will be a
very slow reaction, though. Not like watching hydrofluoric acid etch
glass.