(1) Milk must be classified for bacterial estimate as follows by one of the methods listed in the following table:

 

BACTERIAL ESTIMATE

 

BACTERIAL ESTIMATE CLASSIFICATION	DIRECT MICROSCOPIC CLUMP COUNT OR STANDARD PLATE COUNT	RESAZURIN REDUCTION TIME TO MUNSELL COLOR STANDARD 5p 7/4 *
No. 1 (Acceptable) :
Can.......................	Not over 500,000 per ml...........	Not less than 2 1/4 hours.
Bulk.......................	"      "      "      "      "    "............	Not less than 3 1/4 hours.
Undergrade (Probational) 4 weeks) :
Can.......................	Over 500,000 per ml.................	Less than 2 1/4 hours.
Bulk.......................	"          "          "    ".................	Less than 3 1/4 hours.

 * For enforcement purposes this test must be read at the times shown in the table.

 

(2) Methods for determining the bacterial estimate of milk shall be those described in the latest edition of "Standard Methods For The Examination Of Dairy Products". However in reporting the results, the test must be read at the times indicated in the table.