Using Subtractive Coloration to Make a Colour

If i take e the rainbow palete of finger paints in front of me, and i'm misshing it altogether in equal amounts. Why does that collection of colours gravitate to being a darker, if not blackish color? It depends whether you are using adactive or subtractive coloration,. If you are absorbing colors to make a color - such as blue on a wall- then only one colour comes back which is blue. But snow looks white because when light hits ice crystals they reflect all different colours together. So  it's difference between making a colour because of what you reflect off and what you reflect back that you haven't absorbed. And that's why your p palete