<http://schema.org/description>
"Our rack alkaline-zinc-plated parts occasionally exhibit black or caustic stains that don\u2019t show up for 24 hours. Can we add anything to our plating solution or rinses to eliminate this condition?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/articles/black-stains-on-zinc-plated-parts>