日本語
Food additive databaseprocessing agentChecked 2026-10-02

Acid Clay 酸性白土

Existing food additiveNot on the EU additive list
Purpose
processing agent
On the label
“酸性白土” (acid clay), “不溶性鉱物性物質” (insoluble mineral substances)
Name in the List of Existing Food Additives
酸性白土 (No. 135)
Source and production
Obtained by refining a montmorillonite-type clay mineral. The main component is hydrated aluminum silicate.

In Japan

  • A processing agent obtained by refining a montmorillonite-type clay mineral, with hydrated aluminum silicate as the main component (definition in Japan's Specifications and Standards for Food Additives).
  • Under the standards for use, it cannot be used except when essential for the manufacture or processing of food, and the amount remaining in the food is limited to 0.50% or less (a standard shared with kaolin, bentonite, talc, and others).
  • The category name for labeling is “不溶性鉱物性物質” (insoluble mineral substances). When it qualifies as a processing aid, for example because it is removed during manufacturing, labeling is omitted.

Japan's standards for use

  • Must not be used except when essential for the manufacture or processing of food
  • Residue in food: up to 0.50% (the total amount when two or more insoluble mineral substances are used)

This is a summary of the standards for use. See the source list for the exact conditions.

In the EU

  • It is not on the EU list of food additives (Regulation (EC) No 1333/2008, Annex II), so it cannot be used as a food additive in the EU.

Sources

Checked 2026-10-02. Rules and evaluations change over time. This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.

This page lists facts stated in laws and in evaluations by public bodies; it is not a safety verdict. Additives used in Japan are approved by the government, which sets the foods and amounts they can be used in. The ADI is a guide to the amount that is considered safe to take every day over a lifetime.

Other substances used as processing agent

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