Permanent tint for lashes Transform your brows in just 15 minutes with Eylure Pro-Brow Dybrow in 'Black'. This dye kit will temporarily tint lighter brow hairs, giving you rich, lasting colour for up to 6 weeks. Apply the dye cream for 5 to 10 minutes and easily achieve your desired level of colour. Enjoy bold, trendy brows any time of the year with this at-home Dybrow kit.