I don't have reliable information about a specific work titled "Melba by Malcolm" by Malcolm Morley in the etching medium to provide you with accurate details. While Malcolm Morley is a well-known artist associated with photorealism and printmaking, I cannot verify the details of this particular work without risking inaccuracy. I'd recommend consulting museum collections, gallery records, or the artist's catalogue raisonné for factual information about this specific etching.