16 BULLETIN 570, U. S. DEPARTMENT OF AGRICULTURE. 
All the chemical determinations given in the tables are of value in 
judging the nature of by-products of rice found on the market. The 
presence of rice hulls in rice bran is indicated at once by high ash, 
particularly insoluble ash, and by a low ratio of insoluble to total ash. 
Rice hulls also are indicated by a high crude-fiber content. Low 
figures in protein and fat may be due to an excess of hulls or to an 
excess of broken rice due to poor material or careless milling, but, 
when they are considered in connection with the figures for ash and 
fiber, the character of the product can be judged accurately. 
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