Also, Jack had another process where he rubbed finely ground silver into
the emulsion of the print to darken areas.
Also, the name is spelled Mortensen.
>I don't have any citations for the Etch-A-Tone process. In fact I suspect
>that the pumice method MacDonald used was in fact the Etch-A-Tone process by
>name, as MacDonald was not very careful about such things as the correct
>names that Mortonson might have used. I'm also going on my own memory of
>things over 25 years ago. (I'm not sure of the spelling of his name even
>now, as I have not reference work to check here that would have his name.)
>As far as dates go, I don't know how far back the process goes or when W.M.
>started using it.
>
> I my memory serves me, the pumice method was similar to the wet method in
>that the print was covered with the film of oil paint and then left to dry.
>Then the pumice was used to remove the paint, much the same as the swab and
>solvent was used. It gave the print a much drier and atmospheric quality, as
>the wet method left the print feeling lush and murky.
>
> I mentioned these processes as I have not seen any modern references to
>them and they are quite nice and need very little instructions to do. I
>think most anyone could from these descriptions work out their own method