Oh, now it confused me also, this flour I used is yellow, beacuse it has ben milled from a yellow corn cob. But I found a white corn flour here in a Kaufland shop, a rarity I thought, which was very pale yellow, almost ivory white, and it was milled from a white corn cob...
Let me take a picture and post it...it is definitely finer than polenta, and I would never use this corn flour as thickener, or at least not primarily...we have quite a few traditional dishes made with corn flour. I personally do not think it is fine and poulvery enough...I have seen starches on the shop shelves, but it bears a different name - škrob. Whereas the flour is brašno.