- Hardness Test Should Be Started From The Least hard Pencil.
- Start From Smaller Number Softer To Harder Pencil TO Leave Only ONE Scratch.
Showing posts with label hardness pencils. Show all posts
Showing posts with label hardness pencils. Show all posts
Thursday, July 4, 2019
Hardness Pencils
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DURABILITY OF GEMS MATERIALS DURABILITY is combination of three parameters. HARDNESS: Resistance to Scratching TOUGHNESS: ... -
Unit Of Weight * Gems Are Mearured In Carat * It Is Denoted By (CT) The Name Of Carat Is Derived By Carob Three. Each Can't Is Sp...