Homebrew PCBs

leon Heller wrote:
> ----- Original Message ----- 
> From: "Michel Baguet" <bagmik@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, October 29, 2008 8:30 AM
> Subject: Re: [Homebrew_PCBs] Re: MG Negative Dry Film Resist
> 
> 
>> Hi all,
>>
>> has anyone already use sodium metasilicate for development ?
>> I've read that you can leave your PCB in it without any risk of 
>> over-development and it can last for years.
> 
> I have used it, and it has a lot more latitude than NaOH. It's more 
> expensive, though, and not as easy to find. I prefer NaOH.
> 

1% NaOH and the sodium silicates will strip negative dry film resist.