Our range of Jena glassware uses a special material called Borosilicate Glass.

The gradual infusion of tea results in a beautiful changing diffusion of colour. It’s likely one could find a tea liquor colour for every part of the spectrum. But it’s often hidden away in a mug or teapot.

With Borosilicate glass, it’s possible to enjoy this visual delight.

Let’s get technical for a moment…

Borosilicate glass contains about 15% of the ingredient Boron Trioxide, which allows for a very low coefficient of thermal expansion [the rate at which glass expands when exposed to heat]. This means it won’t crack or shatter under extreme temperature changes like regular glass. It’s also highly resistant to other chemicals or acids, so it’s free of any foreign taste or colour.