I agree with you about its beautiful pigment. Pity that it is toxic.
Art Spectrum sells a Manganese Blue Hue which will do as a substitute.
Mastodon.ART — Your friendly creative home on the Fediverse! Interact with friends and discover new ones, all on a platform that is community-owned and ad-free. Admin: @Curator. Moderators: @EmergencyBattle, @ScribbleAddict, @TapiocaPearl, @Otherbuttons, @katwylder