Homebrew PCBs

----- Original Message ----- 
From: "Kamal Shankar" <kbshankar2000@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, June 26, 2007 5:49 PM
Subject: Re: [Homebrew_PCBs] Etching Tips and Tricks


>> > But I still mix about a table spoon in 250ml of
>> hot
>> > water.
>>
>> That is nowhere near concentrated enough!
>
> Oh no !
>
> What IS the right proportion?

Something like 500g/litre.

>
> Do you use lab grade or commercial grade?

I just buy the stuff from Mega Electronics, or one of their distributors.

>
>> > Also.. does the depth of the etchant matter ?
>>
>> Not really, I just like to have plenty of it.
>
> How do you deal with excess etchant?

Pour it down the lavatory.

>
> Have you ever tried anything else other than FeCl3?

I used ammonium persulphate many years ago, it doesn't last long once it's 
made up as a solution.

Leon