Psst E = Mc² Fine Art Greetings Card, Printed on 350gsm Silk White Card, FSC Certified. 6in x 6in Fine Art Blank Card Psst E = Mc² Fine Art Blank Greetings Card £3.00 Quantity: at £3.00 each Add To Basket Psst E = Mc², very cool card of Marilyn and Einstein. This card is blank inside for your own personal greeting. This is a reproduction of an original piece of my work which is mixed media, hand painted and hand embroidered. Printed on 350gsm silk white card, FSC certified and come individually packed with a premium white 'hammer effect' envelope in a clear cellophane sleeve. Measures 6in x 6in.