(chiefly North American also selvage)
1An edge produced on woven fabric during manufacture that prevents it from unravelling.
- An act in effect between 1774 and 1811 required that blue threads be woven into the selvages of cotton cloth intended for export if a refund of the tax on printed cotton was to be claimed.
- In other cases, a laser was used to create decorative motifs on fabrics, or to cut fabric fringes along the selvage.
- For the neatest finish, cut strips along the selvage using the selvage for the seam allowance.
2 Geology A zone of altered rock, especially volcanic glass, at the edge of a rock mass.
- This type of migmatite is characterized by discrete millimetre - to centimetre-scale discontinuous granitic layers separated by high-grade metamorphic host rock and dark selvages (mesosome).
- Likely all of these factors played some role in initiating beryl precipitation, particularly where mineralization is contained within highly altered vein selvages.
- The fine-grained selvage called a chilled margin, formed in a younger rock in contact with an older rock, has already been mentioned.
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