The rainbow , a breathtaking natural phenomenon ... Blue (450-520 nanometers) Pink, a tint of red, has a wavelength that falls within the red spectrum (approximately 620-750 nanometers).

Shoppers love the Winky Lux Rainbow pH Tinted Lip Balm - the $12 tri-colored lip balm that reacts to your lips' pH to create a natural pink tint while keeping them hydrated and soft. It's not just ...