can be contaminated by very few types of impurities, such as boron and nitrogen. combined with wide transparency, this results in the clear, colourless appearance of most natural diamonds. small amounts of defects or impurities (about one per million of lattice atoms) colour diamond blue (boron), yellow...
formaldehyde: test to determine the residual presence of formaldehyde in textile products finished with chemicals containing formaldehyde. lead content: test to determine any usage of lead or lead contaminants in excess of % of the weight of the total nonvolatile content of paint. mechanical hazard/sharp...
before advanced agricultural methods and more suitable climate led to the concentration of quality flax cultivation in northern europe (most of the world crop of quality flax is now grown in northern france , belgium and the netherlands ). since about the s to s the flax fibre for irish linen yarn has...
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and maintaining soil fertility, reducing the use of toxic agents, and building biologically diverse agriculture certified organic cotton uses only dyes which contain no heavy metals and use less water in the dyeing process. clothing made from organic cotton is softer and free of formaldehyde, which...