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Roman glass beads

Novel glass beads, or glass beads Roman be made of sand, potassium hydroxide, sodium carbonate and colored metals. Depending on the desired color is determined which metal is to be added. Addition of copper, for example, allows for the creation of blue-green color in the glass. From very light to dark. Addition of cobalt provides deep blue colors and manganese ore is added to obtain the yellow-like color. White Roman glass beads created by the addition of antimony and addition of iron creates glass beads with a light blue, green, brown or deep black color.