L-wɛmfo kuw .yɛ adwumayɛbea titiriw a ɛhwɛ nneɛma so, a ɛwɔ mpoano kurow fɛfɛ Qingdao, China. Adwumakuw no ka nnuru foforo a wɔde yɛ nneɛma te sɛ strontium carbonate, strontium hydroxide, strontium chloride, ne sodium metabisulfite ho asɛm titiriw.
Wɔ mmoa a ɛfiri adwumayɛfoɔ a wɔyɛ adwuma wɔ gua so, adwumayɛkuo a wɔhwɛ nneɛma so ne kuw a wɔhwɛ nneɛma so no mmoa ase no, yɛbɔ mmɔden sɛ yɛbɛma adetɔfoɔ anya nneɛma ne boɔ a ɛyɛ den-adeɛ a wɔde aka ho denam nneɛma a ɛyɛ papa, nneɛma a ne boɔ yɛ den ne nnwuma a ɛho nni asɛm so.
