For researchers wishing to investigate the suitability of our various chromogenic β-galactosidase substrates, we offer this sampler kit, which contains 5 mg each of the following five different substrates: X-Gal (10011), Red-β-D-Gal (10012), Rose-β-D-Gal (10013), Purple-β-D-Gal (10014) and Green-β-D-Gal (10015).