Mirror Black
Carder Steuben Club
Black is always elegant...
...Mirror Black was used as a stand alone color...
Mirror Black Rustic (Stump) Vase
                    Shape 2744
...or trimmed in various colors...
Mirror Black Lamp Base with Coral Berry Prunts                     Shape 3589
Mirror Black Lamp Base with Opaque Green Berry Prunts                    
                Shape 3589
Mirror Black Lamp Base with Light Blue Jade
                Shape 3590
...or as a trim color...
Cintra Candlestick Trimmed
        In Mirror Black
               Shape 3178
Footed "M" Handled Urn
           Shape7468
  ...Or
  used           as reeding...
...or Handles...
   ...or Irridized ...
   ...or Irridized
     &
Decorated...
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Carder Steuben Mirror Black is almost always nearly impossible to see light through.  In extremely thin edges of goblets sometimes a pinpoint of purple can be seen, but anything thicker than that and you will see no light.  This is a very important part in identification of Mirror Black.  Sinclaire produced a black that is also opaque.  Sinclaire shapes are very similar to Steuben and with equal craftsmanship.  Sinclaire's pontil is usually much larger than a typical Steuben pontil. 
...Or as below,
acid Etched
...
Shape 7539
           Reeded Cologne
                Shape7330
       Verre de Soie Pitcher
                         with
  Irridized Mirror Black Reeding
Shape 7199
       Verre de Soie Bud Vase
                         with
    Irridized Mirror Black Foot
Shape 2556
Irridized Mirror Black
           Lamp Base
Decorated with Vinings
Shape 2556
"Crackle Aurene"
Mirror Black Etched to Alabaster
Shape 2683
Gold Aurene Etched to Mirror Black
Shape 2683
Mirror Black Etched
to Opaque Light Blue
Shape 3273
Mirror Black Etched
    to Green Jade
Shape 6222
Mirror Black Cut to Clear
H.P.Sinclaire was a glass factory operating in Bath, New York (close to Corning) at the same time that Carder Steuben was being produced.  Sinclaire produced many colors that are near duplicate of Carder Steuben and thier Nubian Black glass is one of these colors.  Differences in how trim was applied, size of pontil, shape, construction, and patterns all help to identify the difference between the two.

Sinclaire Nubian Black
Sinclaire gaffer (Emil Larsen) was more astute at the transition from black to white than the Steuben gaffers.  The transition from black to white is barely imperceptable in Sinclaire's Nubian Black while in Steuben's Mirror Black the transition is just a little more noticeable.
The pontil is the size of an Eisenhower silver dollar on this piece.  A typical Steuben pontil would be the size of a quarter.