Sxey.—On a modification of Common Writing Ink. 559 
A lump of carbonate of ammonia the size of a walnut will generally be 
found sufficient to add to three or four ounces of ink, and, as soon as effer- 
vescence has ceased, the ink is ready for use 
Ink of this description is slightly paler hak that not thus modified, and, 
in drying, does not show quite so black. It is, besides, a little more liable 
to be washed off in part by water, but, to compensate for this, it neither 
corrodes nor clogs steel pens; it flows more readily, and is not so much 
affected by any greasy matter with which it may get in contact as in 
the unmodified variety. 
This kind of ink when dried in hot weather so as to be unusable, can 
be easily recovered by adding water thereto with or without carbonate of 
ammonia as may be required. Being an anti-corrosive ink, any pens which 
have been used with it may afterwards be left therein with very good effect. 
