By Eric Dong This piece is dedicated to Velton Ross, our excellent Patreon supporter whom we appreciate. WALNUT CREEK, CA— A local coffee shop’s attempt at using homemade charcoal powders has received mixed reviews from customers and USDA. “Our espresso is a Columbia-Papua New Guinea blend with notes of dense dark chocolate, vanilla, and a buttery mouthfeel,” owner Jack Haney told Knockbox…