The Dolly Blue was not the soap. It was a small cylinder of blue dye wrapped in a piece of muslin tied at the top with a piece of string and dropped into the rinsing water so that the white laundry looked brighter. The soap was a very crude soda- based concoction which was bought as an unwrapped ,roughly-sawn up bar. It was very hard and had to be grated into a seperate bowl of boiling hot water to melt it before it was put into the dolly tub with the dirty clothes
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