Heritage Open Day: Discover how Alchemy transforms waste from the lead industry into bright blues and greens that grace stately homes in the workshops of the Colour Makers House, rebuilt in 1677. Imagine walking into a room lit by oil lamps and candles, with low beams adorned with bottles of coloured liquid. In the middle of the room, workbenches with bowls of bubbling liquids in front of an old range. Across the room are boxes of coloured clay, molehills and stones waiting to be transformed into ochres. Sheets of copper and lead are ready to be converted into cosmetics for faces and powdering wigs. The 17th-century house is full of period features and a remarkable historic staircase leading upstairs to the artist's studio, which specialises in architectural portraits.