The ink formulation between the two are slightly different. 

  • - Ecco Pigment Pen performs better on tracing (transparent) paper than the Pitt Artist Pens. The lines of the Ecco Pigment are blacker on this paper. The product comes more from the technical corner. It was invented to replace the TG1 ink pens. People that are involved in technical drawing enjoy the pen. The Ecco Pigment is for slow and precise drawing, not for fast sketching. 0.1mm, 0.3mm, 0.5mm and 0.7mm are available in a limited number of colors: red, blue, green and black. Black is available in 9 line widths 0.05mm - 0.8mm. The Ecco Pigment Pens have a metal clip on the cap and also a metal tip.

  • - Pitt Artist Pen is more the artists´ tool for artistic drawing and sketching. The ink is suitable for dynamic drawing and writing.The brush pens are available in 60 colors. Limited colors are available in smaller line widths. Black is availalbe in extra super fine, super fine, fine, medium, brush, soft brush, chisel (calligraphy), soft chisel, bullet and brush and big brush. Medium, fine, superfine and extra superfine have a metal tip. Metallic colors are available in 1.5 mm bullet nibs: green, blue, ruby, copper, silver and gold. All pens have a plastic (polypropylen) clip on the cap. 

The lightfastnesss, erasability and drying speed of the Ecco Pigment is comparable to the black India Ink of the Pitt Artist Pen. They are both document proof, waterproof and suitable for stencils. They are both water-based.