Red and Yellow to make orange (use more yellow than red). Than add some white.
Eggshell can range from white through to brown.
Normally eggshell refers to the finish of the paint rather than the colour
Yes, enamel paints can be mixed.
Well actually you use TWO paints......Red+White...
all colours mix, but it depends what colour you want to make!
Egg shells (used in many craft projects) are quite porous, and will give your paint an excellent ground. Remember however a flat paint will not be very durable (it should not be washed or cleaned) so consider a clear top coat in what ever gloss factor you like. If however if you are asking about the paint finish called eggshell (one having the ability to be gently washed) then it will depend on the age of the "eggshell" paint, the composition of the two (eggshell & flat) paints and the colour of the "eggshell". If the "eggshell" is older than a year, latex or acrylic based and a light colour, then a good washing with TSP or some other gloss remover, and going over it with one or two coats of a good quality flat latex, oil or acrylic paint should do the trick. Oil paint can be directly applied over latex, acrylic or oil... Latex can be directly applied over latex or acrylic but not oil... Acrylic can be directly applied over latex or acrylic but not over oil. If the "eggshell" is less than a year old, oil based or a deep colour, then a good quality primer coat will make the job go much smoother. (Note- use an oil based primer if the "eggshell" is oil based, you can then top coat with any paint formula)
Red is a primary colour. Orange is a secondary colour made from equal parts of the primary colours red and yellow. If you mix the two in equal parts you will get the tertiary colour red-orange.
Green is a secondary colour. To get a secondary colour you must mix two primary colours together in equal proportions. Green is the result of mixing the primary colours Yellow and Blue in equal proportions.
Of the two paints you are going to try mixing, a water based paint (latex), with a spirit based (possibly methalated) . Not a good idea as they will separate. DO NOT MIX! On the containers for these paints you will be told how to wash your brushes ie.. Water for Latex. Turpintine, or Varsol for the Oil based paints and stains. Again, Oil and Water do NOT MIX!!!
Add blue colour in red.
Red is a primary colour, you can not mix to achieve it.
There is blue, red and yellow. You can mix two of these colours at a time to make another colour. Then you can mix the colour that you just made with another primary colour. The secondary colours are purple, green and one other that I can't mthink of right now.
It does not matter how much red (a primary colour) and green (a secondary colour) you mix together, you will always get some variation of brown or grey. Yellow is a primary colour, that means you can not mix to get it. You can't do it. Yellow is a primay color which means that you can't mix colors to get yellow. Red is also a primary color and green is the complimentary color of red. When you mix these two colors you will get a strange shade of brown...but no yellow. Sorry.
Brown can be achieved in one of two ways. You can mix equal parts of the three primary colours; red, yellow & blue. This is the easy way. You can also mix any primary colour and its complimentary colour; red & green, yellow & purple or blue & orange. In either case you should be prepared to adjust the mixture a bit to get the desired brown.