Cups

The tumbler is the oldest form of tamra jal: no lid, no thread, just fill it, leave it and drink it. Three hundred millilitres, about a glass of water. Where that habit comes from is in tamra jal.

The first composition measurement dates from 16 June 2021. To keep our material checks up to date, we had another water bottle analysed. On 21 October 2026, URS Products and Testing in Noida reported 99.18% copper and 0.498% zinc.

Both independent measurements found more than 99% copper. The difference between the measured copper contents is 0.03 percentage points. The 2026 retest therefore supports the earlier finding of a high copper content in our material.

Solid copper at 99.21% (RTC 2021) purity, made from the same copper as the bottle and mug independently tested for food safety, with no coating and no inner lining. You choose between a smooth and a hand-hammered version; what that difference means day to day is in smooth or hammered. Looking for a copper cup with a handle, for coffee or tea? Then have a look at the copper mug.

Set the tumbler out in the evening on your bedside table or the kitchen counter and drink it in the morning. How the ritual fits an ordinary week is in tamra jal in practice, and how often a day is usual in this tradition in how often a day. If the tumbler tarnishes over time, lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice) bring the shine back.