AND THE GERM TEGUMENT SPLITS WHEN THE BATCH OF CEREALS IS SHAKEN . THESE GRAINS RESEMBLE SPROUTED GRAINS BUT MUST NOT BE INCLUDED IN THAT GROUP . SPROUTED GRAINS ARE ONLY THOSE WHERE THE GERM HAS UNDERGONE CLEARLY VISIBLE CHANGES WHICH MAKE IT EASY TO DISTINGUISH THE SPROUTED GRAIN FROM THE NORMAL GRAIN .
4 . MISCELLANEOUS IMPURITIES ( SCHWARZBESATZ ) :
( A ) WEED SEEDS
( B ) DAMAGED GRAINS :
DAMAGED GRAINS ARE THOSE RENDERED UNFIT FOR HUMAN CONSUMPTION AND , AS REGARDS FEED GRAIN , FOR CONSUMPTION BY CATTLE , OWING TO PUTREFACTION , MILDEW , OR BACTERIAL OR OTHER CAUSES .
GRAINS WHICH HAVE DETERIORATED THROUGH SPONTANEOUS GENERATION OF HEAT ALSO BELONG TO THIS GROUP ; THESE " HEATED " OR " SMUTTY " GRAINS ARE FULLY GROWN GRAINS IN WHICH THE TEGUMENT IS COLOURED GREYISH BROWN TO BLACK , WHILE THE CROSS-SECTION OF THE KERNEL IS COLOURED YELLOWISH GREY TO BROWNISH BLACK .
GRAINS ATTACKED BY WHEAT-MIDGE SHALL BE CONSIDERED AS DAMAGED GRAINS ONLY WHEN MORE THAN HALF THE SURFACE OF THE GRAIN IS COLOURED GREY TO BLACK AS A RESULT OF SECONDARY CRYPTOGAMIC ATTACK . WHERE DISCOLORATION COVERS LESS THEN HALF THE SURFACE OF THE GRAIN , THE LATTER MUST BE CLASSED WITH GRAINS DAMAGED BY PESTS .
( C ) EXTRANEOUS MATTER :
ALL MATTER IN A SAMPLE OF CEREALS RETAINED BY A SIEVE WITH APERTURES OF 3.5 MILLIMETRES ( WITH THE EXCEPTION OF GRAINS OF OTHER CEREALS AND PARTICULARLY LARGE GRAINS OF THE BASIC CEREAL ) AND THAT PASSING THROUGH A SIEVE WITH APERTURES OF 1 MILLIMETRE SHALL BE CONSIDERED AS EXTRANEOUS MATTER .
ALSO INCLUDED IN THIS GROUP ARE STONES , SAND , FRAGMENTS OF STRAW AND OTHER IMPURITIES IN THE SAMPLES WHICH PASS THROUGH A SIEVE WITH APERTURES OF 3.5 MILLIMETRES AND ARE RETAINED BY A SIEVE WITH APERTURES OF 1 MILLIMETRE .
THIS DEFINITION DOES NOT APPLY TO MAIZE . FOR THAT CEREAL , ALL MATTER IN A SAMPLE WHICH PASSES THROUGH A SIEVE WITH APERTURES OF 1 MILLIMETRE , AS WELL AS ALL THE IMPURITIES MENTIONED IN THE PRECEDING SUBPARAGRAPH , MUST BE CONSIDERED AS EXTRANEOUS MATTER .
( D ) HUSKS ( FOR MAIZE : COB FRAGMENTS )
( E ) ERGOT
( F ) DECAYED GRAINS
( G ) DEAD INSECTS AND FRAGMENTS OF INSECTS
5 . LIVE PESTS
B . STANDARD METHOD FOR DETERMINING MATTER OTHER THAN BASIC CEREALS OF UNIMPAIRED QUALITY
1 . FOR COMMON WHEAT , DURUM WHEAT , RYE AND BARLEY , AN AVERAGE SAMPLE OF 250 GRAMMES IS PASSED THROUGH TWO SIEVES , ONE WITH APERTURES OF 3.5 MILLIMETRES AND THE OTHER WITH APERTURES OF 1 MILLIMETRE , FOR HALF A MINUTE EACH .
IN ORDER TO ENSURE CONSTANT SIFTING , IT IS ADVISABLE TO USE A MECHANICAL SIEVE , E.G . A VIBRATING TABLE WITH FITTED SIEVES .
THE MATTER RETAINED BY THE SIEVE WITH APERTURES OF 3.5 MILLIMETRES AND THAT PASSING THROUGH THE SIEVE WITH APERTURES OF 1