I could be way off here, but I could've sworn I've worked for a supermarket that, apart from blue Pepsi, at some point sold white Coca Cola. This was in either the 90's or early 2000 though.
And again, perhaps it's my memory playing tricks on me.
How would you really know it's Coca-Cola by just looking at it? Could just as well be something else.
On a vaguely related tangent to this, Coca Cola does not block infrared and near infrared light making it mostly transparent if viewed through an IR capable sensor with the visible spectrum filtered out.
Your best bet is to comb the references cited in the article. There is a good chance the published non-fiction books themselves have further citations.