Reaction mass of 1-amino-9,10-dioxo-4-(phenylamino)-9,10-dihydroanthracene-2-sulfonic acid and sodium 1-amino-9,10-dioxo-4-phenylaminoanthracene-2-sulphonate

Endpoint summary

Description of key information

Not skin sensitising

Key value for chemical safety assessment

Skin sensitisation

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Additional information:

No studies on the "Skin sensitisation" are available for the substance in itself.

Nevertheless a study was conducted with an analogue molecule (Similar Substance 03). Further information are reported in the Read Across justification attached to section 13.

The study was performed according to the OECD guideline 406 and EU method B.6.

Ten males were used as control group and 20 males were used as test group.

The highest non-irritating test article concentration used for challenge application was 10 % in vaselinum album.

No toxic symptoms were evident in the guinea pigs of the control or test group. No deaths occurred.

In this study 0 % of the animals were positive after treatment with the highest non-irritant test substance concentration of 10 % in vaselinum album. Therefore the test article is considered to be a non sensitizer.

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

SKIN SENSITIZATION

Category 1

Substances shall be classified as skin sensitizers in category 1 where data are not sufficient for sub-categorisation in accordance with the following criteria:

(a) if there is evidence in humans that the substance can lead to sensitisation by skin contact in a substantial number of persons; or

(b) if there are positive results from an appropriate animal test.

Specific criteria of animal test:

when an adjuvant type test method for skin sensitisation is used, a response of at least 30 % of the animals is considered as positive.

For a non-adjuvant Guinea pig test method a response of at least 15 % of the animals is considered positive.

Furthermore, stimulation index of three or more is considered a positive response in the local lymph node assay.

Sub-category 1A

Substances showing a high frequency of occurrence in humans and/or a high potency in animals can be presumed to have the potential to produce significant sensitisation in humans. Severity of reaction may also be considered.

Specific criteria:

Local lymph node assay-EC3 value ≤ 2 %

Guinea pig maximisation test-≥ 30 % responding at ≤ 0,1 % intradermal induction dose or ≥ 60 % responding at > 0,1 % to ≤ 1 % intradermal induction dose

Buehler assay - ≥ 15 % responding at ≤ 0,2 % topical induction dose or ≥ 60 % responding at > 0,2 % to ≤ 20 % topical induction dose

Sub-category 1B

Substances showing a low to moderate frequency of occurrence in humans and/or a low to moderate potency in animals can be presumed to have the potential to produce sensitisation in humans. Severity of reaction may also be considered.

Local lymph node assay - EC3 value > 2 %

Guinea pig maximisation test- ≥ 30 % to < 60 % responding at > 0,1 % to ≤ 1 % intradermal induction dose or ≥ 30 % responding at > 1 % intradermal induction dose.

Buehler assay - ≥ 15 % to < 60 % responding at > 0,2 % to ≤ 20 % topical induction dose or ≥ 15 % responding at > 20 % topical induction dose.

Based on animal test (Local lymph node assay) results performed, according to the paragraph 3.4. of the CLP Regulation n. 1272/2008, the test substance is Not Classified as the Stimulation Index is below the threshold of classification at all concentrations.