Not sure if this is of use to you, but as mentioned in a BPH blog here last year, there was an exhibition of Amsterdam prints taken by Turner. The Amsterdam Archive holds some of his prints which you can search for on their online database (Image Bank section) which can be found here.
I checked here, too. They list ten prints. All are just described as "foto" and " foto-afdrukken" -- and all 10 are from May/June 1857 -- too early for carbon prints.
Not sure if this is of use to you, but as mentioned in a BPH blog here last year, there was an exhibition of Amsterdam prints taken by Turner. The Amsterdam Archive holds some of his prints which you can search for on their online database (Image Bank section) which can be found here.
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Michael Pritchard said: \
Michael Wong said: