regret I'm the least of the duck experts, but can offer Leslie Jackson's words regarding the two colours we've just been discussing, though of course you may already be aware of these descriptions from the author's glossary.
ocean green … "A cool pale green colour introduced in 1959 to replace sea green. It was launched along with arctic blue, and remained in production until 1966."
arctic blue ………. "A cool shade of pale blue introduced in 1959 to replace sapphire, launched along with ocean green. The latter was withdrawn in 1966, but arctic blue remained in production until the 1970 catalogue, and was used for both ornamental glass and tableware."
Assume with your interest you do at least have Leslie Jackson's 'Whitefriars Glass' - first issued in 1996 (and reprinted 1999 and 2004) to accompany the Manchester and London exhibitions. It's a bit cheaper than the big book.
P.S. Janet - what's the origin of the expression 'dilly duck', please?