Like other disperse dyes, they are only slightly soluble in water.
[3] This means that people who are allergic to the dyes may develop allergic symptoms (e.g., a rash) when they wear clothes that have been colored with these dyes.
[1] Some patch testing kits for allergens include a mix of Disperse Blue 106 and Disperse Blue 124, and other colors can be tested if a textile dye allergy is suspected.
[3] Treatment mostly involves not wearing dark-colored synthetic clothing.
The American Contact Dermatitis Society named it their Allergen of the Year in 2000.