Different parts of the horse chestnut tree including seed, root, bark and leaf were collected from many street trees in Esztergom and Štúrovo. By steeping, boiling, baking and burning, different local colours were surrendered and have been stored in glass jars with a potential for use. Pure chestnut hearts produced a delicate pink as well as an intense lemon yellow, but the light blue alluded to in eighteenth century texts has so far proved elusive.

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