[Frameworks] eco-bleach effective when tinting/toning? (Sarah Bliss)

[Robert Schaller]

Hi Sarah,

The classic re-halogenating bleach is  the Ferricyanide bleach, which contains Potassium Bromide. Ferricyanide bleach turns the black silver image back into silver bromide, which then is what the toner acts on.  Peroxide or R9 Dichromate bleach remove the silver image altogether, leaving nothing for the toner to act on.  Though, if it was film you just shot, you could process it as reversal, but just put it through the first developer and a peroxide bleach, then tone it instead of (or in addition to, but before)  the second developer.  I've never tried that, but it seems like there's room to explore there!  

I meant that the peroxide eco-bleach wouldn't work as a replacement for Ferricyanide bleach in toning an already finished image: the two bleaches are both called bleaches, but they do entirely different things and are not interchangeable!

-Robert

> On Mar 2, 2022, at 4:57 PM, Sarah Bliss <bliss at sarahblissart.com> wrote:
> 
> Thanks Robert and Morgan.
> 
> Robert, I don’t know what re-halogenating bleach is.  Can anyone else confirm Robert’s sense that that is what’s needed for toning, so that eco-bleach wouldn’t work.  Ricardo or Dawn, any thoughts on this?
> 
> Morgan, hi! and yes.  I was only able to source 12% hydrogen peroxide.  I diluted it to 9% and that has worked well with acetic acid when developing 7363.
> 
> thanks,
> 
> Sarah
> http://www.SarahBlissArt.com <http://www.sarahblissart.com/>
> 
>> From: Morgan Hoyle-Combs <mhoylecombs at yahoo.com <mailto:mhoylecombs at yahoo.com>>
>> Subject: Re: [Frameworks] eco-bleach effective when tinting/toning?
>> Date: February 28, 2022 at 4:35:21 PM EST
>> To: Experimental Film Discussion List <frameworks at film-gallery.org <mailto:frameworks at film-gallery.org>>
>> 
>> Also, keep in mind that 9% peroxide is not available in the US. I was able to get some acetic acid 12% peroxide which has to be diluted to 9%. I have a formula for this and would like to try it out on some Plus-X of mine. 
>> 
>> Also, hi Sarah. 
>> 
>> M
>> On Monday, February 28, 2022, 02:16:32 PM EST, <robert at ontosmedia.com <mailto:robert at ontosmedia.com>> wrote:
>> 
>> 
>> I haven't tried using eco-bleach for toning, but my understanding is 
>> that you need to use a re-halogenating bleach, and eco-bleach is not 
>> that.  It's more like the dichromate R9 bleach, and not what you need 
>> for conventional toning.
>> 
>> On 2022-02-28 11:38, Sarah Bliss wrote:
>> > Greetings friends and colleagues,
>> > 
>> > When reversal developing 7363, I’ve been happily using an eco-bleach
>> > alternative based on Ricardo Leite’s recipe with some tweaks
>> > suggested by Dawn George.  It works really well!  Ingredients are  9%
>> > hydrogen peroxide and 5% acetic acid.
>> > 
>> > Question: can this eco-bleach also effectively replace standard bleach
>> > when tinting/toning film, or does one need to use potassium
>> > ferricyanide + Potassium bromide for that?
>> > 
>> > If yes, any data on how long to bleach the film before tinting or
>> > toning?
>> > 
>> > thanks kindly,
>> > 
>> > Sarah Bliss
>> > http://www.SarahBlissArt.com <http://www.sarahblissart.com/>
>> 
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