Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.


(g) The spongy lead may be bulged, or the positives may be buckled.

This occurs in the negatives also, though not to such an extent as in the positives.

Positives do not swell or bulge as they discharge, but shed the active material.

If the positives are buckled, the negatives will be also, but not to the extent that the positives are.

In the case of the positives, there is no remedy, and the plates should be discarded.

Positives which are rotted and disintegrated are, of course, hopeless, and must be junked.

The positives are 1/4 inch thick, and the negatives 3/16 inch.

Positives which are only slightly warped or buckled may be used again.

If you intend to use some of the positives, they should now be washed.

I have used nothing else for positives on glass since I discovered the preparation.