Most poles lose their colour as they dry out.
Ph. Nigra (running black) is the only species that does not change colour significantly. G.atroviolacea (Java black) also retains some blackness.
A harvested and usually dry pole that has not been treated.
A naturally mottled pole is usually a B.maculata species dried pole.
A pole that has been boiled in hyrdogen peroxide that bleaches the fibres.
The best method to preserve a pole is to keep it out of touch with the soil. Their life can be extended by applying a clear or coloured coating available that can be applied once the pole has dried out.
Chrystal paints in Brisbane produce specialist coatings for bamboo. They can be contacted on 07 3341 3566.