Our colored carboxylated PS latex particles are made by incorporating organic color dye into our carboxylated white PS latex particles. These red and blue beads are used in applications when color visualization is important for detection and are widely used in rapid (lateral flow) tests. Color intensity can be customized to suit your specific needs. Please contact us for details. 300nm and 400nm particles are widely used in rapid tests.Product specifications:Concentration: aqueous suspension of 10% w/vaverage diameter tolerance will be within 10% of each specified catalog numberNaN3 preservative <=0.1%recommended storage 2–8oCavailable for order in 5 mL, 15 mL, and 100 mL quantities