Amberina Glass
from the Glass
Encyclopedia

Amberina glass was first patented in the USA by Joseph Locke and Edward D. Libby in 1883. Locke was head designer for the Cambridge works of the New England Glass Company, and W. L Libbey and Son were proprietors of this glassworks. Amberina Glass is "heat sensitive" glass, which shades in colour from amber at the bottom to red at the top. This colour shading is due to the effects of reheating the top part of the glass before allowing it to cool. Amberina glass contains a precipitate of colloidal gold (as does gold ruby glass), which is heat sensitive and turns red at the right temperature.

If the effect is reversed and the bottom part of a vessel is reheated rather than the top, the result is called "reverse amberina"- which is red at the bottom and amber at the top.

Mt Washington Glass Company of New Bedford, USA, also made amberina glass for a few years in the early 1880s. There was a dispute between the New England Glass Company and Mt Washington Glass about patent rights, which was not resolved by Mt Washington calling their amberina glass "Rose Amber", and in 1886 an injunction was granted against them and they stopped making it.

Hobbs, Brockunier and Co of Wheeling USA also made amberina glass, but they had obtained a license from Libbey/New England Glass.