I kēia manawa, me ka hoʻololi ʻana o nā huahana, hoʻohana nui ʻia ʻo NA2S i nā ʻano āpau o ke ola, i kēia manawa ʻo ka hapa nui o ka mākeke he pepa paʻa o ka sodium sulfide 50-60% ʻaʻole maʻalahi e mālama, hoʻoheheʻe ʻia i loko o kahi hopena ʻeleʻele, loaʻa nā haumia, ʻAʻole maʻamau ka lawe lima a ...
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