U of S | Mailing List Archive | alt-photo-process-l | Re: ferri sesquichlorati

Re: ferri sesquichlorati

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: ferri sesquichlorati
  • From: Murray Leshner <murrayatuptowngallery@yahoo.com>
  • Date: Tue, 17 Oct 2006 19:23:25 -0700 (PDT)
  • Comments: "alt-photo-process mailing list"
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I may be quite too late on this.
sesqui means one-and-a-half, as in a sesquicentennial (150 years). In chemistry I think it implies a 1.5:1 ratio, since atoms in a molecule don't split.
Like water, H2O...it isn't written HO(1/2).
Ferric chloride is the nasty brown liquid used for etching copper circuit boards. Radio Shack (in the US) used to sell it. I have no idea how strong (saturated) it is/was. It stains and is rough on a number of metals, but you folks are ok playing with chemicals.