Why is supposed to be lucky to touch a chimney sweep?
Since pagan times, the images of fire and hearth have been associated with good luck.
Because of his blackened face and his relationship with the hearth, the chimney sweep is therefore said to carry luck with him wherever he goes.
If you meet him and shake hands, the luck rubs off. This is why a chimney sweep often pays a visit to the bride and groom at their wedding, as it's a good omen for their future life together.