7. Conduit Street West, Bayswater.
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.
W. J. Newton.
6. Argyle Street.