54. Use of more than one Class II preservative prohibited. - No person shall use in or upon a food more than one Class II preservative;
Provided that where in column (2) of the table given below rule 55, the use of more than one preservative has been allowed in the alternative, those preservatives may, notwithstanding anything contained in rule 55, be used in combination with one or more alternatives: provided the quality of each preservative so used does not exceed such number of parts out of those specified for that preservative in column (3) of the aforesaid table as may be worked out on the basis of the proportion of which such preservatives are combined.
Illustration: - In the group of foods specified in item 6 of the table given below rule 55, sulpher dioide or benzonic acid can be added in the proportion of 40 parts per million or 200 parts per million, respectively. If both preservatives are used in combination and proportion of sulpher dioxide in 20 parts per million, the proportion of benzoic acid shall not exceed the proportion of 100 parts per million.]
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