• 1% methylene blue solution in superior pharmaceutical quality: a mixture of high-purity methylene blue and purified water, disinfected with chlorine dioxide. • Ultraviolet protection bottle: bottled in opaque brown glass, with a glass pipette for precise dosing. • Universal application: more than 100 years of use as a well-known and proven dye. • Made in Germany: under strict hygiene guidelines and packaged according to DIN EN ISO 9001. • Numerous applications: universal product without heavy metals, preservatives, or additives.