Re: Seeking: (1) orange LED safelight, (2) wire coating rod
Re (2) I wonder if nichrome wire is inert. If so, it has a potential secondary use as a gentle heating element if you put a low current through it. Don Sweet ----- Original Message ----- From: "Ryuji Suzuki" <rs@silvergrain.org> To: <alt-photo-process-l@usask.ca> Sent: Thursday, April 10, 2008 7:20 AM Subject: Re: Seeking: (1) orange LED safelight, (2) wire coating rod > From: martinm <martinm@gawab.com> > Subject: Re: Seeking: (1) orange LED safelight, (2) wire coating rod > Date: Wed, 09 Apr 2008 09:38:35 +0200 > > > By the way their amber types (~590nm) are pretty > > monochromatic (bandwidth around 30nm or so). > > I wanted to avoid that range, partly because 590nm may fog > high speed emulsions using a green sensitive dye. My OC > safelight certainly fogs emulsions using any of my ortho dyes. > I think something like 625nm with fairly narrow spectral > emission would be ideal because it can be used for two projects. > > I actually looked at various LED manufacturers and I think I'm > going with Osram. > > > You may try these: > > www.dynesonline.com/metering_rods.html > > www.sinotime.8k.com/photo.html > > www.rdspecialties.com/Page.asp?Script=1 > > Thanks! > > The second link contained a wound rod with a handle (358.jpg) > which is pretty much what I'm looking for, except I want 316 > stainless or at least something I know to be inert to the > emulsion... But at $30 a piece, I might try one first anyway. > > > An alternative would be using threaded rods. As of now I've > > been unable to locate them, but there certainly exist PA-6, > > PTFE and other plastic threaded rods which could be easily > > cleaned. > > Good idea! A threaded rod made from some hard polyamide or > fluoropolymer of low friction and good surface action > (wettability) would be ideal. > > But do you think they are straight enough to coat glass plates? > > -- > Ryuji Suzuki > "The truth that I am seeking is in your missing file." > (Bob Dylan, Something's Burning Baby, 1985)
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