-- Alchemy Printmaking & Photography PO Box 633 Ranchos de Taos, NM 87557 http://www.quetzl.com/Alchemy/html.index Date: Wed, 13 May 1998 15:20:43 -0600 From: John Rudiak <wizard@laplaza.org> Subject: Re: List Cleansing To: John Lowen <autochrome@worldnet.att.net> Cc: Bob_Maxey@mtn.3com.com, alt-photo-process-l@skyway.usask.ca, effrey.d.mathias@worldnet.att.net Message-id: <355A0EAB.3DF2@laplaza.org> Organization: Alchemy Printmaking and Photography MIME-version: 1.0 X-Mailer: Mozilla 3.0Gold (Win95; I) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit References: <87256602.007B3578.00@usslcsmtp.mhz.com> <3559BA10.3750@worldnet.att.net>John Lowen wrote: > > Now that the list has been laundried - Can anyone of the chemists out > there tell me how to blacken brass to use as a waterhouse stop on a > Darlot lens? > > thanks - > > john
I take this recipe from the book "Gunsmithing" by Roy Dunlap (sometimes it pays to have a hobby)
To Blacken Brass (pg402)
Potassium Sulfide- 1 oz Ammonium Hydrosulphide- 2 1/4 oz Water- 1 gal
"Dip polished, cleaned parts until deep black in color, wash and dry."
Good luck! John
-- Alchemy Printmaking & Photography PO Box 633 Ranchos de Taos, NM 87557 http://www.quetzl.com/Alchemy/html.index