If you are using natural ingredients instead of the artificial colourings produced in much of the industry, then tomatoes are used to make the pasta red, while spinach is added to make a distinctive green tinge. When I went to Italy two years ago, there was a blue-black pasta made from calamari, or squid!
usually to make you pasta pink you use the pink sauce! Pink sauce is made with red and white sauce you mix it together and it makes a delicious sauce you can eather put tomatios chunks in it or pinches of mozzarella to melt in it. Trust me it makes a difference when you cook it on a pan before you put it on the pasta. Even if you just are cooking white sauce you can put pinches of paramseon and some olive oil is good too.
Chilli will colour the pasta red but may make it very hot! Be better to try paprika instead.
Or experiment by adding a very small amount of food colouring, which you can buy from most food stores or supermarkets. But remember the food will look unnatural and not be inviting to eat in some colours. So avoid colours like blue, black, brown and purple. Pale green pasta looks quite acceptable though.
Nothing is added, brown pasta is made from wholemeal flour instead of the normal white flour.
Beetroot :D
Beetroot :D
Pink pasta gets its colour from the red food dye added while the pasta dough is raw.Pink pasta traditionally gets its color from beet juice added to the pasta dough. Unfortunately, inexpensive novelty pasta may be colored with artificial food dyes.
Yellow
Pasta is yellow and CuSO4 is blue, so the resulting colour would be green. If you added a larger quantity of CuSO4 you would probably get a slightly bluer colour.
a plain pasta is when the pasta is boiled only with salt and no sauces will be added in it.
yellow and orange
Red
The dough used to make egg pasta should not have any coloring or flavorings added. The egg yolks should provide all the color and flavor. Commercial products that include additional yellow food color or any flavorings are skimping on the eggs, and therefore need additives to be appealing and tasty.
When it is made with veggies mixed with flour instead of just being mixed with flour only.
If you are talking about mixing paint colours, nothing added to brown will ever make yellow. Since yellow is a primary colour it can not be mixed from other colours.