You can make pasta with different colour: greeen with spinach, basil or chard, red with beetroots or tomato concentrate paste, black with ink fish (Sepia or Cuttle fish). The basic principle is to prepare a normal dough and then to add the colouring matter. Flour must be added in order to get the normal consistency. In the case of spinach I found a good procedure to get green pasta.
I roll and cut the dough, then I added the boiled and well strained spinach finely chopped or cut with the blender in order to get a thick green cream.
After I mix in a bowl the cut dough with the green cream.
I add flour untill I get a no sticking smooth dough .
And then I roll the dough with the Imperia machine or with the rolling pin. Then I may use to make a lasagna or to make agnolotti (a special shape of ravioli).