A more familiar common use is in silver-coloured modern circulation coins. A typical mix is 75% copper, 25% nickel, and a trace amount of manganese. In the past, true silver coins were debased with cupronickel. Despite high copper content, cupronickel is dark bronze in colour when in storage, but is a light copper colour when polished. Thermocouples and resistors whose resistance is stable across changes in temperature contain the 55% copper-45% nickel alloy constantan.
For the past 3 months, I've been taking several popular nootropics in relatively recommended dosages. The results have been generally positive (mental stamina, desire to learn, impressive thoughts at times), however, I am experiencing the following unwelcome side-effects. -Rash and skin irritation.
Common side effects of allopurinol may include diarrhea, nausea, and gout attacks. In most cases, side effects reported with the drug are minor and either require no treatment or are easily treated. However, there are also a number of potentially serious allopurinol side effects that may occur. Notify your healthcare provider if you develop any serious problems, such as painful urination, blood in the urine, or a skin rash.