Exemption for Acid Slurry denied where trade identity and primary use showed it was only an input, not a synthetic detergent.

Acid Slurry under Chapter heading 3402.90 was treated as an input for detergent manufacture, not as a synthetic detergent in trade or primary use, so it did not qualify for exemption under Notification No. 88/88. The captive-consumption amendment was regarded as a substantive expansion of the exemption because the original entry covered only goods consumed in the same factory; it therefore did not operate retrospectively to extend relief to use in another unit. Spent Sulphuric Acid generated during manufacture was treated as a distinct by-product and remained dutiable as excisable goods.

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Issues: (i) whether Acid Slurry falling under Chapter heading 3402.90 was eligible for exemption as synthetic detergent under Notification No. 88/88 dated 01.03.1988; (ii) whether the amendment to the captive-consumption entry in the notification operated retrospectively as a clarificatory change so as to extend exemption to use in another unit of the assessee; and (iii) whether Spent Sulphuric Acid emerging in the manufacture of Acid Slurry was dutiable.

Issue (i): whether Acid Slurry falling under Chapter heading 3402.90 was eligible for exemption as synthetic detergent under Notification No. 88/88 dated 01.03.1988.

Analysis: The exemption covered synthetic detergents, while Acid Slurry was only an input used in the manufacture of detergent cake or powder. Its character in the market, its primary use, and trade understanding showed that it was not itself sold or used as a ready detergent. The chemical report could not by itself convert the product into a synthetic detergent for the purpose of the notification.

Conclusion: Acid Slurry was not eligible for exemption as synthetic detergent.

Issue (ii): whether the amendment to the captive-consumption entry in the notification operated retrospectively as a clarificatory change so as to extend exemption to use in another unit of the assessee.

Analysis: The unamended entry exempted only goods consumed within the same factory of production. The amended entry widened the exemption to goods manufactured and used in another unit. Since the amendment changed the legal position and moved the product from taxable to exempt depending on the version of the entry, it was not merely clarificatory and could not be applied retrospectively.

Conclusion: The amendment did not operate retrospectively and did not the assessee.

Issue (iii): whether Spent Sulphuric Acid emerging in the manufacture of Acid Slurry was dutiable.

Analysis: Spent Sulphuric Acid arose during the manufacturing process as a distinct by-product. The settled position treated such by-product as excisable goods liable to duty.

Conclusion: Spent Sulphuric Acid was dutiable.

Final Conclusion: The denial of exemption and the duty demand were sustained, and the appeal failed in entirety.

Ratio Decidendi: A product claiming exemption under a tariff notification must answer to the description in trade and in its primary use, and an amendment that enlarges an exemption from one factual setting to another is substantive rather than clarificatory unless the text clearly shows otherwise.

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