Penny Lilac of the Penny Lilac was adapted from that used for revenue stamps in Britain from the early 1860s. In that respect it represented a break with 40 years of tradition in postage stamp design. Its predecessors (the Penny Black, the Penny Red and the Penny Venetian Red) all had rectangular designs. The use of the colour lilac for low value definitives was extended in 1884 when other low-value stamps were issued in lilac, with green then being used for higher-value stamps. The Penny Lilac was a surface-printed stamp and was issued in two forms: Penny Lilac stamps are often found
Penny Black (research project) Penny Black (research project) The Penny Black Project is a Microsoft Research project that tries to find effective and practical ways of fighting spam. Because identifying spams consumes a recipient's time, the idea is to make the sender of emails "pay" a certain amount for sending them. The currency or the mode of payment could be CPU cycles, Turing tests or memory cycles. Such a payment would limit spammers' ability to send out large quantities of emails quickly. The project's name is derived from the Penny Black, the world's first adhesive stamp used for paid postage. The goal of the