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reports as below- "We have taken X-ray picture of; (i) A pure glass (no diffraction line); (ii) A pure crystalline material (diffraction lines ... some glassy phase is also present. We are enclosing herewith 4 X-ray diffraction patterns." 8. This report makes a distinction between a pure

bituminous substances can be proved by physical techniques such as NMR, X-Ray diffraction and moleculer weight determination or by chemical analysis for vanadium, sulfur