Amberina glass ranges in shades of light to dark red and sometimes fuchsia at the top to shades of light to darker amber at the bottom, or visa-versa in which case it is called reverse Amberina. It is created by mixing a compound including gold in the glass and reheating the object before it completely cools. The major producer of Amberina in the U.S. was the New England Glass Company, Toledo, Ohio, who patented the process in 1883 and thus prevented competitors from making the glass without a license. It's successor, the Libbey Glass Company made the glass into the 1890's.
This lovely Reverse Amberina punch cup is the inverted baby thumbprint pattern and applied clear amber handle. Reversal of the colors is rather scarce and to find a nice example is a great find. Nice shading of amber to red with polished pontil; about one-third red and two-thirds amber. The mug measures 2 1/4" in height and 3" across the top. Colors are darker than shown in the photos. There are no cracks, chips or repairs; a minor roughness on the handle that happened during the production process.