Cadmium, a transition metal
through toxicity dangerous
for a human body fatal,
silver, metallic, traitorous.

Its discovery was simultaneously
from two different men,
their country Germany,
Stromeyer and Hermann,

Named after an ancient greek king,
dragons, gods, ancient mythology,
Cadmus, Thebes was his thing,
turned into a snake, an irony.

Nickel-Cadmium batteries a hit,
You know the coin-like cell,
most companies try to quit.
they work amazingly well.

Television, black and white,
or in green and blue colour kathodes,
Cadmium a companion at night,
and part of very recent QLED methods.

To sum it up, Cadmium is toxic,
good for light and energy,
but the exposure makes you sick,
so its better Cadmium-free.

It served as well, but historical,
we should evolve above toxic waste,
probably it can be used medical,
with hard regulations traced.