The most difficult glass riddlesChemistry quiz
Cranberry glass is made by adding ..?
Cranberry glass or 'Gold Ruby' glass is a red glass made by adding gold salts or colloidal gold to molten glass. The glass is typically hand blown or molded. Legend holds that cranberry glass was first discovered when a noble tossed a gold coin into a mixture of molten glass
This photo has been taken at a seaglass beach in Hawai'i. How is the sea glass formed?
from lava droplets that fall to the sea during land volcano explosions
in deepwater volcano explosions
during lightning strikes
Sea glass beaches are created from years of dumping garbage into an area of coastline. Sea glass begins as normal shards of broken glass that are then persistently tumbled and ground until the sharp edges are rounded.
What are these vintage glasses for?
Legend has it the shape of the glass was modelled on the breast of Marie Antoinette. The broad surface area allows the champagne to lose its carbonation more quickly, making it not suitable for the current style of very dry champagnes. It therefore fell out of fashion except for traditional occasions such as weddings, where it is often stacked in layers to build a champagne tower.
What kind of material is this cooktop made of?
Glass-ceramic materials share many properties with both non-crystalline glass and crystalline ceramics. The negative thermal expansion of the crystalline ceramic phase can be balanced with the positive expansion of the glassy phase. At a certain point (~70% crystalline) the glass-ceramic has a net expansion near zero and can sustain repeated and quick temperature changes up to 1000 °C.
What was added to this glass to make it blue?
Powdered cobalt glass, called smalt, has been historically important as a pigment in painting and pottery. It is colored to a deep powder blue hue using cobalt ions derived from cobalt oxide. Cobalt aluminate can be used in a similar way, and is now more common, often known as "cobalt blue".