Hi, i just happened to come across Mark Carder's way of painting realism. Its quite fascinating and easy to understand. My question is, in one of his videos he makes the steps for a neutral steel cup by starting with color black (60% blue and 40% brown) and made his way towards the brightest step, and at the same time making sure the colors are matched. Now if say the color group is blue, how does the step start? Does it still start from black and goes up towards brightness and at the same time getting the right shades of blue in it, or it starts from french ultramarine, and i have to make it go up in brightness and as well as down towards the blacks?