Cheap And Discounts Free shipping Indigotrisulfonic acid potassium salt CAS:67627-18-3 >55.0%(LC) scientific research reagent C16H7K3N2O11S3 Wholesale. Buy Directly From Merchant Heepani Tools Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.