The trouble of gutter oil is so rampant that the national safety apparatus started a marketing campaign in 2011 to stamp out the "four black pests" (打四黑除四害) — black workshops, black factories, black markets and black gambling dens. What initially began being an investigation into making use of recycled food https://sometimessth.blogspot.cl/search/label/url-HHsGyDomCQKwyFArt3CDokfJX