All Faber-Castell Washable Markers have bright washable inks made from food-grade vegetable dyes. Markers have long-lasting, water-based ink which allows them to be re-hydrated by placing the nib in water! By dipping dry markers in water they are instantly rejuvenated instead of being thrown away! In addition, the markers have a ventilated safety cap to prevent choking. They are of course non-toxic, acid-free and conform to ASTM D-4236.