Diffusion Transfer Printing ("Polaroid" peel-apart) recipes

[alecrmyers]

Try also https://onyxmet.com/index.php?route=product/product&product_id=1252

Here's an Etsy item:

https://www.etsy.com/listing/1545151684/sodium-borohydride-99

You can try sodium hypophosphite too (hard to get where I live.)

Alternatively, take a leaf from our palladium/platinum printing colleagues - maybe try a pinch of ferric oxalate with the palladium chloride solution and expose to UV (or leave in the sun). I would still use some PVP as a capping agent. Oxalic acid might work too.

 

[OrientPoint]

I purchased Sodium Borohydride from "MacPool" in Ireland on Etsy three weeks ago. It arrived last week.

https://www.etsy.com/shop/MacPool

 

[Donald Qualls]

sodium hypophosphite

Another option would be sodium dithionite. In the US, it's sold in the laundry aisle of the supermarket as Iron Out (not super high purity, but it works as a self-fogging second developer for B&W reversal and might work for a receptor sheet if it keeps long enough).

 

[alecrmyers]

I did a lot of work with sodium dithionite last year without a lot of success, but I've changed developers somewhat since then so I gave it another go just now. Image is neutral tone (which is good) but Dmax is low - paler than it appears in the photo below. That could be worked on, most likely:

By the way - IronOut is only 15-40% dithionite (aka 'hydrosulphite'). I haven't tried it in place of the laboratory standard reagent.

https://summitbrands.com/wp-content/uploads/2018/03/Iron-OUT-Powder-English-GHS-Rev-02-12-2018.pdf

I don't think the keeping quality is very important: once the palladium chloride is reduced (which process occurs in the vial before the paper is coated), you'd quite like any residual reducing agent to get lost. If it hangs around in the receiver paper then it might diffuse to the emulsion and cause fog.