I've used it on maple necks. One coat of a light amber tint is probably enough to give it a subtle aged look. Two for a more obviously aged look. Any more and it then becomes more of a colour in its own right. Some lacquer suppliers do both a light and a dark amber tint. I've only used the light stuff, though the dark stuff might give a more smoke-impregnated look to it. Spray it on first then cover it with protective clear coats (otherwise it's liable to wear off). I'd go with subtle, as it's very easy to overdo the effect in isolation. Keep a copy of the picture with you as a guide. Too little tint will look better than too much.