Welsh Dry Steam
Welsh Dry Steam is a naturally occurring semi-smokeless fuel - much softer than anthracite, but more clean-burning than house coal.
Usually used to 'raise steam' in railway engines, traction engines and steam-powered boats - also available for domestic use and offered in three sizes - Cobble / Large Nuts / Small Nuts under the trade name of 'Gloda' - produced at the Ffos-y-Fran Colliery in South Wales.
Best suited for closed appliances and Rayburn-type cookers, not AGA cookers.