Okay, you might think that I am crazy but I am not. I have done this myself and it works.
If you have minor scrapes or scratches to your woodwork, before sending it to the French Polishers try this simple and sustainable way of repairing.
Crack the shell of a hazelnut (stay with me please) and remove the hazelnut. Now rub the affected area with the hazelnut and as you do this, you will see the wood darken. Do this until the wood has reached the desired colour. Now go and try it and let me know how impresssed you were :D