Triarylmethanes Group

These substances were identified for action under the Chemicals Management Plan (CMP). This screening assessment focuses on 6 of 7 substances referred to collectively as the Triarylmethanes Group.

Summary of publications

Substance group CAS RN Common name DSL name Public comments on the draft screening assessment Final screening assessment Proposed risk management approach Conclusion on section 64 criteria Follow-up activities
Triarylmethanes 548-62-9Footnote a Basic Violet 3 Methanaminium, N-[4-[bis[4-(dimethylamino)phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-methyl-, chloride HTML HTML HTML Meets one or more of the criteria Refer to proposed risk management approach
569-64-2 Malachite Green Methanaminium, N-[4-[[4-(dimethylamino)phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]-N-methyl-, chloride
1324-76-1Footnote a Pigment Blue 61 Benzenesulfonic acid, [[4-[[4-(phenylamino)phenyl][4-(phenylimino)-2,5-cyclohexadien-1-ylidene]methyl]phenyl]amino]- None Does not meet None planned at this time
2390-59-2 Basic Violet 4 Ethanaminium, N-[4-[bis[4-(diethylamino)phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-ethyl-, chloride HTML Meets one or more of the criteria Refer to proposed risk management approach
2390-60-5 Basic Blue 7 Ethanaminium, N-[4-[[4-(diethylamino)phenyl][4-(ethylamino)-1-naphthalenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-ethyl-, chloride
3844-45-9Footnote a Brilliant Blue FCF Benzenemethanaminium, N-ethyl-N-[4-[[4-[ethyl[(3-sulfophenyl)methyl]amino]phenyl](2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo-, hydroxide, inner salt, disodium salt None Does not meet None planned at this time
Footnote 1

This substance was not identified under subsection 73(1) of the Canadian Environmental Protection Act, 1999 but was included in this assessment as it was considered a priority on the basis of other human health concerns.

Return to footnote a referrer


Date Activity
October 17, 2020 Publication of the Final Screening Assessment for the Triarylmethanes Group. The Proposed Risk Management Approach for Certain Triarylmethanes, specifically CAS RNs 548-62-9, 569-64-2, 2390-59-2 and 2390-60-5 was also published for a 60-day public comment period. The related notice was published in the Canada Gazette, Part I: Vol. 154, No. 42.
December 8, 2018 Publication and start of 60-day public comment period on the Draft Screening Assessment for the Triarylmethanes Group (including follow-up activities for CAS RNs 548-62-9,  2390-59-2, and 2390-60-5) and the Risk Management Scope for Certain Triarylmethanes, specifically: Basic Violet 3 (CAS RN 548-62-9), Malachite Green (CAS RN 569-64-2), Basic Violet 4 (CAS RN 2390-59-2), Basic Blue 7 (CAS RN 2390-60-5). The related notice was published in the Canada Gazette, Part I: Vol. 152, No. 49.


A seventh substance, (CAS RN 632-99-5) was initially identified as being part of the Triarylmethanes Group at the outset of the third phase of the CMP. This substance was subsequently determined to be of low concern to both human health and the environment, through other approaches. Conclusions for this substance are provided in the Final Screening Assessment for the Rapid Screening of Substances with Limited General Population Exposure.

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