The Portland Vase,an amazing piece of Roman glassblowing technique,used this method to create dual glass colors and high detail on a single piece.

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The dip-overlay method involves dipping a glass object in one color and then overlaying it with another color, which creates a dual color effect. This technique was used in the creation of the Portland Vase.

The Portland Vase,an Amazing Piece of Roman Glassblowing Technique,used This