On 3 November 2023, the UK Health and Safety Executive (HSE) started a 60 day commenting period on the GB mandatory classification and labelling (MCL) proposals for the following substances:

1. 1,2-dihydroxy-9,10-dihydroanthracene-9,10-dione (Pigment Red 83)

2. 1-hydroxy-4-(p-toluidino)anthraquinone (Solvent Violet 13)