SI-RO-MARK fluid is the only sheep marking fluid approved as properly scourable by all of the world's leading wool processors.
The latest formulation has been tested by CSIRO and proven to be scourable--though obviously the most scourable mark is no mark at all.
SI-RO-MARK is available from sheep and wool supply firms throughout the USA. If you do not find it at your farm and ranch store, have them contact Premier. (We're the national importer and distributor.)