When the surface of leather has worn away, leaving the part affected extremely soft and absorbent of moisture, it is not long before an actual hole appears. If the worn part is treated in time with white of egg the surface may be completely restored so that the coming of a hole is prevented. As soon as the leather shows signs of wearing, apply the white of an egg with a clean brush.
When the application has sunk in and started to set brush over some more. Continue doing this until the worn part has been built up again and all roughness has vanished. Leave for about twenty-four hours and then apply a little leather polish, finishing with a soft cloth.