Red Snow was far more economical in its use of fissile material than the Green Grass warhead in the Yellow Sun Mk.1 bomb, Britain's first production hydrogen bomb. A Yellow Sun Mk.2 with Red Snow, therefore, cost £500,000 compared to £1.2 million for the Mk.1. RAF Bomber Command wanted Violet Club replaced as soon as possible, so 37 Yellow Sun Mk.1s were delivered by the end of 1959. Deliveries of the Yellow Sun Mk.2 commenced in January 1961, and 43 were delivered by the end of the year. In November 1958. Red Snow also replaced Green Grass as the warhead in the Blue Steel stand-off missile.