Aniline Dyes. A class of synthetic, organic dyes originally obtained from aniline (coal tars),and were the first synthetic dyes. Today the term is used with reference to any synthetic organic dyes and pigments, in contrast to animal or vegetable coloring materials, and synthetic inorganic pigments.
From Wikipedia, the free encyclopedia. Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by soil organisms.he concentration of SOM in soils generally ranges from 1% to 6% of the total topsoil mass for most upland soils. Soils whose upper horizons consist of less than 1% organic matter are mostly limited to desert areas, while the SOM content of soils in low-lying, wet areas can be as high as 90%.
Composition. Soil is composed of three types of particles: sand, silt and clay. Sand makes up most of soil, and does not have terrific water holding capabilities. The clay particles in soil are very small and do no allow much water to drain.Silt is the second largest component of soil with characteristics of both sand and clay.ypes. There are three types of loamy soil; each is determined by its composition. Light loamy soil consists of more sand than clay or silt. Medium loamy soil is the most sought after because it contains equal amounts of each component.