Title

Removing Acid from Papers used in Lithographic Printing.

Author

Mémorial Encyclopédique

Source

Sydney Herald (Sydney)

Details

29 July 1833, page 2, column 4.

Publication date

29 July 1833

Type

News

Language

English

Country of context

Australia

Full text

Removing Acid from Papers used in Lithographic Printing. – Most of the paper used in copper-plate and lithographic printing has an acid reaction; due, doubtless, to the processes of whitening, or to the alum used in its manufacture. This acid soon injures the texture of the lithographic stones, and after, at most, thirty impressions have been taken, the stone greases, to use the expression of the workmen, and the impressions are imperfect. M. Joumar remedies this greasing of the stone in a very simple way: - he passes the paper, intended to receive the impression, through weal lime-water, which neutralizes the acidity; he leaves it through the night thus wetted and matted, and on the following morning either dries it, or takes off the superabundant moisture, keeping that degree of softness which the printing requires – Mémorial Encyclopédique, &c.

[Sydney Herald, English extracts, 29 July 1833, p.2, col.4.]