Homebrew PCBs

----- Original Message ----- 
From: "Chris Hart" <kc8ufv@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, July 25, 2007 2:21 AM
Subject: Re: [Homebrew_PCBs] Re: Etching Tips and Tricks


> Just don't put it in, walk away, forget about it, and go to bed. That's
> the quick way to get the toner floating on the etchant. :)
> Kamal Shankar wrote:
>
>> > I discovered about 15 years ago a technique which
>> > has worked
>> > flawlessly for me and etches in about 5 min.: Float
>> > the board,
>> > copperside down, on the etchant. The surface
>> > tension of the FeCL3
>> > easily supports the board. As the copper disolves
>> > into the FeCL3
>> > the Fe, which is heavier, drops to the bottom of the
>> > container.
>>
>> Anyone else had this brainwave ?
>>
>> Sounds nice ! So why do others use agitators ?

It's difficult to see when it is fully etched. The technique has actually 
been around for 30 years or so!

Leon