PSA to everyone who is at each other's throats about what 'cool toned' foundation is, cool toned is red. Not blue. You do not have a 'blue' cast to your skin if you're cool toned. You're just hypothermic if you look blue.
Red, or very pink skin, is cool toned. Orange is warm toned. Or peachy-colors. Yellow is neutral. So if you're putting on foundation and the foundation is correct but the shade looks like nuclear peach or apricot on your skin, it's way too warm for you. Add a little bit of purple to cool it down. Not. Blue. Because the blue will cancel with the orange, and it will make you look grey.
Also, please note that if you're cool toned, you're probably buying foundations a few shades too light as well, because they're painfully orange and the only way to get less color is to go lighter with cheap brands. Try getting something a little darker and adding purple and you won't look like a corpse (if that's not your goal. If it is, you're killing it <3)