Moulding Graphite

I've started to experiment with making my own graphite, which is to be used as the drawing medium for the devices. The process involves combining powdered graphite, clay flour, and water into a sludge-like mixture for moulding. Once moulded the mixture is left to dry, then fired at 1800 F (1000 C). The following images show the products used + the preliminary tests.

Products - Graphite lubricant (used by locksmiths) + Clay flour (for sculpting + modelling).
Powdered contents - finely ground graphite.
Powdered contents.
Simple forms created after mixing graphite, clay flour, and water in a small bag. (2:1, graphite to clay ratio)
The forms are left to dry before firing, which I haven't tested yet. Some concerns: strength of the fired graphite, darkness of lineweight (small dried, unfired pieces appear to draw on paper relatively well). To address these concerns more clay may need to be added to the mixture + charcoal powder for darkness.

The industrial manufacturing process is described at: How a pencil is made