I think one of the problems is that color and what you see is somewhat tightly related where taste and how taste works is highly varied. While you can get some

I think one of the problems is that color and what you see is somewhat tightly related where taste and how taste works is highly varied. While you can get some sort of single-molecule chemical representation of some specific smell or taste, that would be static (as in, the formula or construction wouldn't change) but most people would smell different things. I suppose for those 'inventions' the recipe or method would be trademarked/copyrighted/patented but not the result.