Original sentence: Although this dispersant has been omitted from the approved list since 1998, existing stocks that pre-date removal from the list may be permitted for use away from rocky shorelines subject to prior approval.Corexit did not pass the rocky shore test when submitted for renewal of its inclusion on the list and was consequently dropped.UK authorities have an approved list of products which must pass both "sea/beach" and "rocky shore" laboratory toxicity tests, following a review of approval procedures over a decade ago
Edited sentence: , as although this dispersant has been withdrawn from the approved list since 1998, existing stocks that pre-date removal from the list may be permitted for offshore use subject to certain conditions.This product failed the rocky shore test, though it is important to note that it passed the at sea test.UK authorities have an approved list of products which must pass both "at sea" and "rocky shore" laboratory toxicity tests, following a review of approval procedures over a decade ago