All characteristic lignocellulose specimens made from birch veneer shorts during prehydrolysis and furfural production were studied as carbonisation starting materials. To elucidate the impact of water-soluble substances of lignocellulose on the potential of pores forming, two parallel samples of lignocellulose were prepared, from which one was leached with water. Cellolignin contained 24.5-27.7% water-soluble substances composed of 6.2-7.5% sulphuric acid, 13.5-16.5% levulinic acid 41-51% reducing substances (sugars) and 26-35% unidentified substances- ash, lignans (maximum in UV spectra at λ = 286.6 nm). It must be noted that the charcoal yield was high from the leached lignocellulose too – up to 42-43% on the oven dry lignocellulose mass basis. Testing of the carbonised granules made from washed lignocellulose demonstrated the same high mechanical strength as in the case of unleached lignocellulose-containing water soluble extractives acting as some kind of binders.