ʻO ka lanahu pitch, he pōkole no ka pitch tar pitch, ka hana hoʻoheheʻe ʻana o ka lanahu ma hope o ka wehe ʻia ʻana o ke koena distillate wai, no kahi ʻano asphalt artificial, maʻamau no ka wai viscous, semi-paʻa a paʻa paha, ʻeleʻele a ʻālohilohi, i loko o ke kalapona 92 ~ 94%, hydrogen e pili ana i 4 ~ 5%. Lanahu ...
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