Standard Input-Output Norms suspension for Acid Black 52 restricts permitted chemical inputs and mandates export-use compliance.

The FTP entry prescribes Standard Input-Output Norms for Acid Black 52 listing Beta Naphthol, Sodium Nitrite and Twitchell Oil with specified per unit proportions; the SION is suspended by public notice. Applicants must determine proportions of inputs used in manufacture and ensure imported goods correspond to those used or required in the export product.

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