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small amount, perhaps 2 per cent, of this material which has escaped further nitration. The substance is stable and less reactive even than a-TNT, and a small amount of it in the purified TNT, if insufficient to lower the melting point materially, is not regarded as an especially undesirable impurity. The principal impurities arise from the m-nitrotoluene (b.p. 230-231°) which is formed to the extent of about 4 per cent in the product of the mononitration. We omit discussion of other impurities, such as the nitrated xylenes which might be present in consequence of that

completely with the and y-TNT to form red-colored materials

Figure 47. Commercial Sample of Purified TNT (25X).

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