Jlgreco probably meant: "did they not add coloring [during production]", for which to make sense the color would have to be added during the production, which c

Jlgreco probably meant: "did they not add coloring [during production]", for which to make sense the color would have to be added during the production, which could very well be; the article probably meant "found a chemist who could remove the color", implying the color is a by-product of the production and comes from other ingredients. So, the article is not explicit about this, but the whole context would lead me to believe that it is the second explanation that was meant.