Homebrew PCBs

On Wed, 7 Apr 2004 08:29:56 -0400, Jeremy Taylor <jt@...> wrote:

> The biggest problem with phosphoric acid is it's low vapor pressure at 
> room
> temperature,i.e. when heated it evaporates, vaporizes very readily. 
> (faster
> than water)   This result in more irritating fumes than most other 
> etches,
> and is probably the reason very few people use it as such.
>
>

nothing for me then..

ST