U of S | Mailing List Archive | alt-photo-process-l | Re: glyoxal v. formaldehyde

Re: glyoxal v. formaldehyde

Yes Judy, but my 2nd question is based on the notion that when it has
finished outgassing it is all gone.  By contrast, something that doesn't so
readily outgas presumably remains in the size to continue doing its toxic
work (unless perhaps the act of hardening the size neutralises it in some

Don Sweet

----- Original Message ----- 
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@usask.ca>
Sent: Tuesday, April 08, 2008 5:19 PM
Subject: Re: glyoxal v. formaldehyde

> On Tue, 8 Apr 2008, Don Sweet wrote:
> > 2.    (Even more naively perhaps) if f'de will outgas at room
> > but g'de will not, what implications does that have in terms of the
> > comparative residual toxicities of the hardened size on prints?
> Let me hazard a guess, which may be way off, but seems logical from
> here... The reason (I'm guessing) the formaldehyde outgasses more could be
> because it's a gas or closer to a gas at room temp... rather than a factor
> of its toxicity.  In fact I daresay there are many gases that aren't toxic
> at all, like maybe helium?  Or oxygen?
> J.