supply of 12191 -gel etching containing 35-37% phosphoric acid syringe - packing 30ml bulk syringe with refill syringe of 1.2 ml ; use on dentin and enamel to create optimal bonding surfaces. ultra-etch etchant can be used for 5 seconds to remove the salts created by etching porcelain.; self-limiting1 on dentin; penetrates smallest fissures and won%u2019t run on a vertical surface; precise placement.12191 -gel etching containing 35-37% phosphoric acid syringe - packing 30ml bulk syringe with refill syringe of 1.2 ml ; use on dentin and enamel to create optimal bonding surfaces. ultra-etch etchant can be used for 5 seconds to remove the salts created by etching porcelain.; self-limiting1 on dentin; penetrates smallest fissures and won%u2019t run on a vertical surface; precise placement.,12191 -gel etching containing 35-37% phosphoric acid syringe - packing 30ml bulk syringe with refill syringe of 1.2 ml ; use on dentin and enamel to create optimal bonding surfaces. ultra-etch etchant can be used for 5 seconds to remove the salts created by etching porcelai n.; self-limiting1 on dentin; penetrates smallest fissures and won%u2019t run on a vertical surface; pr ecise placement. ] => limited