Colour Variations with Automatic Pens
Using a clean pen, load the pen (using a brush on one side of the pen) with one colour of ink (say Yellow), then load a a few drops of another colour (say Blue) on the other side of the nib. When you write with the pen the ink will blend slowly as you write. As you finish a stroke add a few drops of another colour and the blending will change again. Varying the quantity of fresh ink loaded will control the speed of colour change. Border pens can carry two colours. With certain inks three colours can be loaded.