Farrow and Ball India Yellow No.66
India Yellow is famously named after the pigment which was collected from the urine of cows who had been given a special diet of mango leaves! It creates a really cosy and surprisingly un-yellow space, when contrasted with a dark tone like Tanner's Brown. It should however be used in moderation in small rooms where its intensity may be overwhelming.
Use Mid Tones Undercoat.