Difference between revisions of "Copper number"
Jump to navigation
Jump to search
(username removed) |
|||
| Line 1: | Line 1: | ||
== Description == | == Description == | ||
| − | A measured value used to determine the condition and stability of [ | + | A measured value used to determine the condition and stability of [[cellulose]]. The copper number is determined as the amount of [[copper]] reduced from the cupric to the cuprous state by 100 grams of cellulose pulp. A high copper number indicates that the cellulose is not pure and may have been degraded by bleaching. A low copper number indicates that the cellulose is not degraded. This test does not account for the presence of [[lignin]]. |
== Authority == | == Authority == | ||
Revision as of 10:52, 13 January 2014
Description
A measured value used to determine the condition and stability of Cellulose. The copper number is determined as the amount of Copper reduced from the cupric to the cuprous state by 100 grams of cellulose pulp. A high copper number indicates that the cellulose is not pure and may have been degraded by bleaching. A low copper number indicates that the cellulose is not degraded. This test does not account for the presence of Lignin.
Authority
- The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982