The name was a reference to a kind of early smokeless powder, which was a sort of fluffy white and looked a bit like large grained washing powder. They were among the first shotguns to have bored barrels rather than built-up barrels, like Damascus twist or laminated.
Given the increased power of modern loads, the likely chambering for older shorter shells, and the age of the gun, I would not fire it even if it looks to be in good condition.
Jim