Akro Agate slags ("Striped Onyxes") were available in the following colors (in increasing order of rarity): amber, purple, blue, green, red, aqua, clear, vaseline, and orange. Slag Marble.
U.V Vaseline Akro Agate Slag Marble Vintage Machine Made 1920s-50s 19/32" 15.2mm
U.V Vaseline Akro Agate Slag Marble Vintage Machine Made 1920s-50s 5/8" 16mm
Amber Akro Agate Slag Marble Vintage American Machine Made 1920s-50s 5/8'' 16mm
Blue Akro Agate Slag Marble Vintage American Machine Made 1920s-50s 5/8'' 16mm
5 Akro Agate Slag Marbles Vintage American Machine Made 1920s - 1950s 5/8'' 16mm
