While both publications do not specifically state that mold begins to grow in 24 to 48 hours, this is the generally accepted time frame used by water damage responders to determine when mold begins to grow. So we have the inference from the guidance documents that mold can begin to grow in 24 to 48 hours.
By Material: Drawing with graphite is very different than liquid ink for instance. So you might say, Dry media> Graphite, Charcoal, Pastel, Marker vs. Wet Media> Ink, Watercolor, even diluted Oils and Acrylics. By Technical Approach: Drawing can be Linear or Tonal - drawing contour lines vs. filling color shapes.
Other products like this exist, each little islands where they can be very useful, depending on what everybody has. E-drawings comes to mind here as useful, if Solidworks is in play, for example. One other format is STL, which is a polygon file format used for rapid prototyping.