_Dr. Diamond's Process for Albumenized Paper._--Photographers are under
many obligations to DR. DIAMOND, particularly for the valuable information
communicated through "N. & Q.," and his obligingness in answering
inquiries. I make no doubt he will readily reply to the following
questions, suggested by his late letter on the process for printing on
albumenized paper.
Will the solution of forty grains of common salt and forty grains of mur.
amm., _without the albumen_, be found to answer for ordinary positive paper
(say Canson's, Turner's, or Whatman's)? and, in that case, may it be
applied with a brush?
Will the forty-grain solution of nit. sil. (without amm.) answer for paper
so prepared? and may this also be applied with a brush?
Should the positives be printed out very strongly? and how long should they
remain in the _saturated_ bath of hypo.?
Is not the use of sel d'or subject to the objection that the pictures with
which it is used are liable to fade in time?
DR. DIAMOND says that pictures produced by the use of amm. nit. of silver
are not to be depended on for permanency. If this be so, it is very
important it should be known, as the use of amm. nit. is at present
generally recommended and adopted.