_Sir William Newton's Process: Further Explanations._--In reply to your
correspondent F. MAXWELL LYTE, who is desirous of knowing my motive for
washing the paper over with chloride of barium previous to iodizing--
In the first place, I find that it appears to give strength to the paper.
Secondly, that the action in the camera is better and more certain.
Thirdly, it keeps cleaner in the bringing-out process, thereby allowing a
longer time for a more complete development.
Fourthly, I have never found any _solarizing_ take place since I have used
it (about three years); and, fifthly, I find that it keeps longer and
better after it is excited for the camera.
From the observations which I have made since I have made use of chloride
of barium, I conclude that it has the effect of _destroying_ any injurious
properties which may be in the paper, and more especially with respect to
the SIZE; and besides which, when combined with iodide of silver, greater
intensity is obtained in the negative.
I have occasionally prepared paper without chloride of barium, but I have
always found (except for positives) that I could not rely upon it with the
same degree of certainty. I need scarcely add that throughout the whole of
this process the greatest care and attention is required, and that the
water should be constantly agitated while the paper is in it, and that the
water should be once changed.