... in a negative, DR. DIAMOND recommends, as the most effectual mode of stopping them, a little gamboge neatly applied with a camel-hair pencil. Where a great intensity is desired, Indian ink may be applied in the same manner, taking care in both cases to smooth off the edges with a dry brush. The cyanide of potassium applied in the same way, but with very great care, will remove ... — Notes and Queries, Number 215, December 10, 1853 • Various
...
