How do I use EC - - 421-170-6 for compliance screening?

Match EC - - 421-170-6 on your raw material safety data sheet (SDS) against EU annex entries. All entries sharing this EC number are listed on this page. For each matched entry, review the annex, concentration limits, product type conditions and warnings.

EC 1 record

EC - - 421-170-6

Q: What is EC number - - 421-170-6 in EU cosmetics?

EC - - 421-170-6 is a seven-digit identifier from European Commission chemical substance inventories (EINECS, ELINCS or NLP). It uniquely identifies the substance in EU regulatory databases. All EU annex entries listing this EC number are shown on this page.

Q: What is the difference between EINECS, ELINCS and NLP EC numbers?

EINECS covers substances on the EU market before 18 September 1981. ELINCS covers substances notified after that date. NLP (No Longer Polymers) covers substances that lost polymer status. All three use the EC number format and are referenced in EU cosmetics annex records.

Q: How do I check if my formula contains a substance with EC - - 421-170-6?

Use the INCI Checker on CosIng Checker to scan your ingredient list by INCI name against all EU annex records. For EC-based cross-referencing, compare EC - - 421-170-6 from supplier SDS documents with the entries listed on this page.

EC - - 421-170-6 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Records for EC - - 421-170-6

1 total

Annex

III

Entry

204

DIHYDROXYINDOLINE

2,3-Dihydro-1H-indole-5,6-diol and its hydrobromide salt (see note 17).

- Can cause allergic reaction - You have ever experienced any reaction afther colouring your hair - You have experienced a reaction to a temporary 'black henna' tattoo in the past

CAS

29539-03-5 - 138937-28-7

Max concentration

How EC - - 421-170-6 is used on this site

EC - - 421-170-6 is a European Commission substance identifier from inventories such as EINECS, ELINCS or NLP. In the current dataset, 1 annex record shares this EC number, which makes the page useful for matching supplier documentation to the relevant cosmetic-law record.

Use this page when you have EC - - 421-170-6 from an SDS, specification sheet or internal raw-material list and need to see every linked Annex II–VI entry in one place. The records above are the fastest route to annex placement, concentration limits, warnings and product-scope conditions.

Frequently asked questions

EC - - 421-170-6 is a seven-digit identifier from the European Commission chemical substance inventories (EINECS, ELINCS or NLP). It uniquely identifies the substance in EU regulatory databases. The EU annex entries listing this EC number are shown above.

EINECS (EC 200-001-8 to 299-999-9 and 300-000-5 to 399-999-0 range) covers substances on the EU market before 18 September 1981. ELINCS covers substances notified after that date. NLP (No Longer Polymers) covers substances that lost polymer status. All three use the EC number format and are referenced in EU cosmetics annex records.

Match the EC number on your raw material safety data sheet (SDS) or specification sheet against EU annex entries. All entries sharing this EC number are listed above. For each matched entry, review the annex, concentration limits, product type conditions and warnings to confirm compliance with your formulation and product category.

Use the INCI Checker to scan your ingredient list by INCI name against all EU annex records. For EC-based cross-referencing, compare the EC number from supplier SDS documents with the entries listed on this page and review each entry's conditions individually.

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Tools & next steps

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