Multiblock prints use two or more blocks to build up an image when printed over one another. Conventionally, different colours are used on each block, or the same colour in different densities. Further variations can be created by allowing the ink to dry between laying down each subsequent layer, or by printing quickly, a technique known as wet-on-wet. As I work with oil based inks, I tend to favour wet-on-wet, as I enjoy watching the colours mixing and drying together on the paper.
The beauty of multiblock printmaking is that the blocks can be inked up in different colours to totally alter the feel of a print. The greater the number of blocks used, the broader the final range of colours and marks which can be achieved. It can feel a bit daunting to begin with, but with experience multiblock can yield some fantastic results. The trick is in getting the blocks lined up well (known as registration), and every printmaker has their own technique for doing this.