Note:
Distinctions should be made between coarse particulate carbon or granular carbon (larger than about $100\text{μ}\text{m}$, but smaller than about $1\text{cm}$ in average size), fine particulate carbon or powder or flour (between $1$ and $100\text{μ}\text{m}$ in average size) and colloidal carbon (below approximately $1\text{μ}\text{m}$ in size in at least one direction), e.g. carbon blacks and colloidal carbon.