. Discovery. Science. 1 10. 3.—EFFECT OF A RE.^GENT blA E-bLACK IRoN-GALl. INKS OF THE SA>IE TYPE IX WRITING OF 1909 AND 1921. ink showing progressivelv diminishing intensity of colour from the top to the bottom of the page. It is needless to add that the register's genuineness was not established. REFERENCES Forensic Chemistry. By A. Lucas. (Arnold, i6>.) Inks : their Composition and Manufacture. 2nd Edition. By C. Ainsworth Mitchell and T. C. Hepworth. (Griiifin, 9s.) Documents and their Scientific Examination. By C. Ainsworth Mitchell. (Griffin, los. (>d.) (An article by the sa
. Discovery. Science. 1 10. 3.—EFFECT OF A RE.^GENT blA E-bLACK IRoN-GALl. INKS OF THE SA>IE TYPE IX WRITING OF 1909 AND 1921. ink showing progressivelv diminishing intensity of colour from the top to the bottom of the page. It is needless to add that the register's genuineness was not established. REFERENCES Forensic Chemistry. By A. Lucas. (Arnold, i6>.) Inks : their Composition and Manufacture. 2nd Edition. By C. Ainsworth Mitchell and T. C. Hepworth. (Griiifin, 9s.) Documents and their Scientific Examination. By C. Ainsworth Mitchell. (Griffin, los. (>d.) (An article by the same author on Pencil Pigments in Writing will appear in the January number.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London [etc. ] Professional and Industrial Pub. Co. [etc. ]
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