Cottage cheese is naturally a yellow colour due to the cream dressing, but to increase consumer acceptance and appeal of the final product titanium dioxide is usually added to the dressing to make it a brilliant white colour and enhance marketability of the finished product. In the United States the FDA allows the additive in many dairy products (not whole milk) up to 1% of total volume by weight, but it must be labelled in the ingredient list. It may also be used in Canada and the European Union. Relatively recently producers have added this ingredient in nanoparticle form. In the USA the FDA does not restrict nanoparticle technology usage in food, but in Europe it must be first submitted for approval as a food ingredient. According to the Project on Emerging Nanotechnologies it is found in hundreds of products, not always labelled as such, including many organic products, however a number of large US producers have denied using it.