Very fine odourless red pigment can be used as a strong colouring ingredient in non-food applications. This rust is naturally formed, rather than created artificially, it therefore will contain trace impurities that won’t affect any normal reactions used in dye craft. For making thermite reactions (which are used for joining railway tracks, among other things) you’ll want to do a little test first.
For making an authentic red sail colour, as found on Brixham trawlers, use iron oxide, clay soil (with very little biological activity) and your choice of oil. Have your men daube your sails liberally throughout the voyage.
Also known as Diiron Trioxide, Hematite (from its blood-red colour), rust and iron oxide. This dye has been ground to an exceptionally fine powder, with 95% of particles at 53 microns or below. In millimetres each particle is 0.053 millimetres or smaller, this make our powdered iron oxide suitable for polishing glass and precious stones and jewellery.
Other uses of iron oxide powder include: ceramic colourant, brick making, concrete staining and paints. Water extractions can colour soap and influence other chemical processes.