ON MARKING INK FOR MARKING LINEN, ETC. 103 
the bottle used in the preparation of the syrup should not 
have a capacity more than about a third above the quantity 
to be made. — Pharm. Joarn. 
ART. XXXIII. — ON MARKING INK, FOR MARKING LINEN, &c. 
WITHOUT THE USE OF A MORDANT. 
By Mr. Redwood. 
The practice of marking linen and other similar fabrics 
employed as wearing apparel, or for domestic use, with a 
preparation of silver, commonly called Marking I?ik, has 
prevailed for many years, and has now become almost uni- 
versal. The preparation first introduced for this purpose 
consisted of a solution of nitrate of silver, thickened with 
gum arabic and coloured with sap green ; but in using this 
solution it is necessary previously to apply to the article to 
be marked, a preparation or mordant, consisting of a solu- 
tion of carbonate of soda. 
The following formula has been very generally adopted 
in the preparation of this kind of marking ink : 
Jfc. Carbonate of Soda ^ss. 
Distilled Water §iv. 
Mix, and sign " The preparation or Mordant 
Jfc. Nitrate of Silver 3j. 
Gum Arabic 3ij. 
Sap green £j. 
Distilled water f.gj. 
Mix, and sign " The Ink." 
The ink made from the above, or a similar formula, which, 
