Slightly magnetic, apparently all cobalt pigments are.
Cobalt green is sometimes known as Rinman's green or Zinc Green is a semi-transparent blue-green, soft in appearance. The deep in the name means leaning more towards blue than yellow.
I love the Cobalts, there is synergy between the various hues and a delicacy reminiscent of using earth pigments.
In masstone a dark green, spread thinly with a palette knife the transparency becomes obvious. Once white is added it produces very delicate greenish, grey tints, it is a gentle tinter so mixes need to be created with care not to overwhelm it.
It reminds me of a slightly cooler Terre Verte but with a little more punch in tinting power. I think it would be excellent in a portrait palette.
Pigment - PG19
Vehicle - Linseed Oil
Opacity - Semi-Transparent
Tint Power - Low