(a) Sampling method. There shall be selected at random from the lot, the number of sample containers specified by the following table:

For lots of over 700 containers, one additional sample container shall be selected for each additional 200 containers or fraction thereof.

(b) From the sample containers selected in accordance with paragraph (a), select the three containers which appear to contain the least mature grapes. From these three containers, select the two that contain grapes which appear to be the least mature of the three. Remove from each of these two containers 20 percent of the grapes, by weight, but not less than two bunches, from a contiguous area of each container which appears to be the least mature. Combine the grapes removed from both containers, crush, and extract the juice for testing. After extraction, agitate, thoroughly mix the juice, and test. If the test result complies with the soluble solids standard specified in this article, no further testing is required.

(c) If the result of the soluble solids test as specified in (b) above fails to comply with the soluble solids standard specified for the variety, proceed to the second test as follows: thoroughly stir the juice used for the soluble solids test, measure out 10 c.c. of this juice, and titrate to determine the ratio of soluble solids to acid; if this ratio is equal to or higher than the ratio standard of 20 to 1 and the minimum soluble solids standard as specified in this article, no further testing is required.

(d) If the results of either the soluble solids test provided in (b) above, or the ratio test provided in (c) above, fail to equal the standard specified for the variety of grape being tested, proceed to the third test as follows: remove the least mature appearing grapes from the third sample container by the same procedure prescribed in (b) above, extract the juice of the grapes selected from this third container, thoroughly mix the juice, and proceed with the soluble solids test, determine the mathematical average soluble solids percentage of the first test, (b) above, and this third test (d); this percentage shall be deemed the soluble solids percentage for the lot; if the result of this test complies with the soluble solids standard specified in this article, no further testing is required.

(e) If the results of the soluble solids test provided in (d) above fail to equal the standard specified in this article for the variety being tested, proceed to the fourth test as follows: thoroughly stir the juice used for the soluble solids test provided in (b) (the 2-box test) and (d) above (the 3-box test); remove 10 c.c. of juice from each test, combine and thoroughly mix these two quantities of juice, and remove 10 c.c. of this combined juice and titrate; if the result of this test complies with the ratio standard of 20 to 1, and the minimum soluble solids as specified in this article, no further testing is required.

(f) A second official sample may be taken and tested for maturity after the immature grapes from the containers in the lot failing the previous test have been removed.