I assume you are referring to decal solution made with hydrochloric acid, since there is no other possible source of chlorine in any decal solution that I know of. The chlorine in such a solution is in the form of chloride (Cl-) ions, and there is no reaction between such ions and formaldehyde molecules, so no chlorine gas could be generated in such a solution. If this were the case then formol-saline would also generate chlorine since it also contains chloride ions and formaldehyde.
> From: firstname.lastname@example.org on behalf of Anne Saulsbery
> Sent: Tuesday, May 22, 2007 2:10 PM
> To: email@example.com
> Subject: [Histonet] Chlorine gas
> Has any one heard that mixing decal solution and formalin would cause
> the formation of chlorine gas?
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