So here we've got a thalablu with a green shade, quinacranone red and a handsy L.A. which is a light version. I did this to get a real the blackest black you could use a handser L.A. medium but this will get us pretty close. So you can mix these in any way you want really but I'm just going to do it mixing with the thalablu and a quinacranone red first. So this is a very strong tinter so we're not going to need as much. So this is the the Mars black just so you can see the next switch up in comparison. This is slightly darker. I mean this is slightly bluer so I could add a touch more of the red and a little touch more of the yellow. This version you see has a very blue undertone in comparison to the pre-mix black. Another way to make a chromatic black that is a black that doesn't contain any of the PB black pigment in it is to use a thalablu and quinacranone red. Gamling the paint manufacturers make an actual black pre-mix with these together and you can be very handy for tinting colours down because it's got quite a neutral tone to it. The only problem with it is because you're using a thalablu and quinacranone red which are both very transparent pigments if you look there at the quinacranone you see how transparent it is. It's good for tinting colours down but not necessarily good for coverage. If you look at the Mars black it's very opaque, very good for covering things. So you've just got to pick the right black for the right part of your painting or to decide what you're actually trying to achieve with the painting.