I could not find a real German word beginning with "C".
They all are from Latin and similiar to the English words.
Now I've choosen cyan.
Cyan (HCN) is a chemical compound.
It's salts KCN and NACN are a strong poisons , any criminal novels based on it...
Cyanblue is a beautiful color - well, let's take cyanblue!
Posted for Mrs.Nesbitt's ABC Wednesday