Cameo Bronze is a creamy off-white with thin streaks of brownish slag. Like Mandarin Slag, the amount of color varies by individual piece. It is uranium glass and like custard and vaseline it glows bright green under untraviolet light. It is marked with an M on the pontil in addition to the smaller “M” on the left side.
One of those older colors you never see, two cameo bronze collies showed up on eBay in late 2017, from two different sellers. Final prices were surprisingly low, considering how hard these are to find.