Compare the cost of unburned brick and red brick

Unburned brick are using industrial waste as the main raw material, the cost is lower.
Its industrial waste can be fly ash, powder, slag, slag, stone nitrate, as well as sand and other raw materials, as long as you have these local raw materials, then the cost of unburned brick will be greatly reduced, and various tax concessions and various subsidies. Unburned brick made while using industrial waste can also play a role in environmental protection.