Saturated: dissolve crystals until there is impossible to continue doing it. Board: 1.5 mm single sided copper clad FR4 ----- Original Message ----- From: Colin Constant To: Sent: Tuesday, November 25, 2003 12:35 AM Subject: Re: [EE]:PCB etching: gravity method works > >I use the gravity method, with saturated ferric chloride solution. As the > >specific gravity of the solution is higher than the board, it floats > >easily. > >Sadly, this is not so easy with ammonium perchlorate. > > I'm not sure what you mean by "saturated", and I'm not sure what you mean by > "board". > > But I"m sure that the 1/16" FR4 boards I'm using are denser than the ferric > chloride I'm using :-) > > Colin > > _________________________________________________________________ > Add photos to your e-mail with MSN 8. Get 2 months FREE*. > http://join.msn.com/?page=features/photos&pgmarket=en-ca&RU=http%3a%2f%2fjoi n.msn.com%2f%3fpage%3dmisc%2fspecialoffers%26pgmarket%3den-ca > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.