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Carnelian (also spelled cornelian) [3] is a brownish-red mineral commonly used as a semiprecious stone. Similar to carnelian is sard , which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably.
A rating between 0 and 8 is awarded by identifying which one of the eight strips on the bluewool standard card has faded to the same extent as the sample under test. [4] [5] Zero denotes extremely poor colour fastness whilst a rating of eight is deemed not to have altered from the original and thus credited as being lightfast and permanent.
This file has an extracted image: Holmgren's coloured wool test for colour blindness, Europe, Wellcome L0058974 (cropped).jpg. Licensing This file is licensed under the Creative Commons Attribution 4.0 International license.
For example, if the lightfastness of the colourant is indicated to be 5 on the Blue Wool scale, it can be expected to fade by a similar amount as the strip number 5 in the Blue Wool test strip set. The success of the test can be confirmed by comparing the test strip set with the reference set that was stored protected from the light. [12] [13]
The S numbers originated in England, [4] where the worsted spinning process was invented and arose from the worsted yarn count system for stating the fineness of yarn. The worsted count (also known as the Bradford count) was the number of 560-yard (510 m) lengths (hanks) of worsted yarn that 1 pound (0.45 kg) of wool yields. [5]
Scratch hardness. The Mohs scale of mineral hardness; The Vickers hardness test; The Brinell scale; The Janka hardness test; The Rockwell scale; The Durometer scale; The Barcol scale; The Leeb rebound hardness scale; The Rosiwal scale; The Meyer hardness test; The Knoop hardness test
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Meyer's law is an empirical relation between the size of a hardness test indentation and the load required to leave the indentation. [1] The formula was devised by Eugene Meyer of the Materials Testing Laboratory at the Imperial School of Technology, Charlottenburg , Germany, circa 1908.
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