Fig. 15.
1. Natural wool fibre unproofed.
2. Wool fibre showing proof on surface, filling up the cells and rendering the same dye-proof.
3. Fur fibre from surface of veneered felt, showing dye deposited in cells and on the surface, bright and lustrous.
4. Wool fibre as in No. 2, with dye deposited on surface of proof.
5. Section of proofed and veneered body, showing unproofed surface.
6. Section of proofed body without "veneer."