Re: acid bath for cyanotype

[Tom Ferguson <tomf2468@pipeline.com>]

An acid pre bath will cause subtle blue staining (seen in highlights) with
some papers. At least with my water. So do check for this.

-- 
Tom Ferguson
http://www.ferguson-photo-design.com

> From: sstoney@pdq.net (shannon stoney)
> Subject: acid bath for cyanotype
> 
> Judy wrote:
> 
>> However, I did not compare the effect of the acid precoat to simple double
>> coating, and/or an acid bath as first wash, which is said to intensify
>> cyanotype.
> 
> I tried the acid bath for the first wash with cyanotype, and it did
> intensify it, but it sort of worried me, because so much blue came out into
> the bath. It seemed as if it was washing away a lot of the prussian blue.
> So I stopped doing it.  Instead I give the last bath a shot of acid.
> 
> --shannon
> 
>