Abstract
DECIPHERING CHARRED DOCUMENTS.—Mr. Raymond Davis, of the Bureau of Standards, Washington, finds that the written and printed matter of papers that have been thoroughly charred, as, for example, by being heated in an iron box or safe, may be deciphered by placing the charred sheet in contact with a fast or medium plate for a week or two in the dark and then developing as usual. There appears to be an emanation that affects the plate except where the charred ink acts as a protective coating. It is curious that films need a much longer contact than plates, and that sometimes the effect is reversed unless the film is previously washed and dried.
Article PDF
Rights and permissions
About this article
Cite this article
Research Items. Nature 111, 160–161 (1923). https://doi.org/10.1038/111160a0
Issue Date:
DOI: https://doi.org/10.1038/111160a0