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Cotton paper is typically graded as 25%, 50%, or 100% cotton. Usually it can be checked by holding the cotton paper up to the light and looking just below the watermark for a number. 100% cotton paper may contain small amounts of acids, and should be tested or certified before use for archival documents.
Watercolor paper is often made entirely or partially with cotton. [6] [7] This gives the surface the appropriate texture and minimizes distortion when wet. [8] Watercolor papers are usually cold-pressed papers that provide better texture and appearance with a weight at least 300 gsm (140 lb).
In the United States cotton counts between 1 and 20 are referred to as coarse counts. [5] NeK or NeW (Worsted Count): The number of 560 yd lengths per 1 lb of yarn. NeK is an indirect measure of linear density. [5] NeK is also referred to as the spinning count. NeL or Lea (Linen Count): The number of 300 yd lengths per 1 lb of yarn. NeL is an ...
The density of paper ranges from 250 kg/m 3 (16 lb/cu ft) for tissue paper to 1 500 kg/m 3 (94 lb/cu ft) for some specialty paper. Printing paper is about 800 kg/m 3 (50 lb/cu ft). [22] Paper may be classified into seven categories: [23] Printing papers of wide variety. Wrapping papers for the protection of goods and merchandise. This includes ...