Cobalt Reduction Tumbler
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by Sirius Glassworks
Peter Gudrunas is the founder of Sirius Glassworks and a master glassblower working in an ancient art, forming contemporary glass that is prized for its classic beauty.
Details: Each tumbler is formed with hand tools and varies slightly in size and color. These gradient tumblers have mirror-esque exteriors with gradient details and a cobalt interior. The cobalt material reacts varyingly to heat application and changes to a wide array of deep pinks to creamy greens, and between mirrored and ceramic-like finishes.
Ingredients & Materials: Handblown glass.
Measurements: This item measures approximately 2.5" in diameter and 4.5-6.5" tall, and holds 10-12 fl. oz.
Care & Use: Hand wash only. Do not use with hot liquids or transfer between icy and hot conditions. Room temperature or cold liquid and ice cubes are safe.