Looking at the Product Picture, You Can Compare the Lower the Content, the Lighter the Color, Pink to Purple, and to Dark Purple, the More Purple the Color, the Darker the Color. the Higher the Content, the Surface Color of the Ball Should Be Evenly Cracked, or Different Colors, This May Be the Original Waste Processing. Please Pay Attention to the Real Potassium Permanganate Ball, Which Can Deal with Formaldehyde and Harmful Gases of Toluene. the Fake One May Be Polluted. Take a Look at the Picture below Patiently.