Question

a basic gas used for manufacture of washing gas

Answer 1

coal gas
The history of manufactured gas, important for lighting, heating, and cooking purposes throughout most of the nineteenth century and the first half of the 20th century, began with the development of analyticaland pneumatic chemistry in the eighteenth century. The manufacturing process for "synthetic fuel gases" (also known as "manufactured fuel gas", "manufactured gas" or simply "gas") typically consisted of thegasification of combustible materials, usually coal, but also wood and oil.