Preface ALOHA ARTISTS. This page is toward color theory, about colors of light matching colors of pigment and colored crystals. In this course "All About Color" are crystals and their element composite make-up, plus the colors wavelength characteristics, because they influenced this pigment to light Real Color Wheel
Salt: Salt, also called sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes called common salt to distinguish it from a class of chemical compounds called salts.
Soil - Soil classification: The two principal systems of soil classification in use today are the soil order system of the U.S. Soil Taxonomy and the soil group system, published as the World Reference Base for Soil Resources, developed by the Food and Agriculture Organization (FAO) of the United Nations.
This page contains list of various types of paper based on their end use, process of manufacturing, raw material used etc. Papers can be graded in 'n' numbers of ways and if we count all permutation and combination of grades total grades may well exceed 10000.