Trained on black on white illustrations – but can produce color images depending on checkpoint model and prompt. Generally, the more complex the prompt = finer lines, but that isn't always the case. Using 'Solid white background' in your prompt usually helps if you want an isolated image.
Can also be used to get better line-texture in etchings and engravings – say if you want to do styles like Albrecht Dürer or Gustave Doré.
Been mostly using the PixelWaveTurbo 02 when using the LoRA. Pairs well with the ParchartXL LoRA, and the Only Black Lora – if you're into combining stuff.