How do you get old ball pen mark off white leather? Possible at all?
I have tried IPA, acetone and even rubbing it with pumice stone (lilghtly!) already, no use 
I don't want to damage the leather too much?!
try mineral oil with a cotton ball, very lightly, then in circular motions. Used this for years on leather car seats, works like a charm
A look at what is currently available on eBay
 REFILL CARTRIDGE Chaco Liner Pen Style (White), Marking Fabric, Clover USA US $4.95 
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 TYRE TIRE MARKING MARKER PEN WHITE TOUCH UP PERMANENT US $3.15
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 Drug Rep Pens 3 KeTek Heavy Metal White w/ Red Bumby Grips Wide Bodys Mark8771 US $7.50
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 HOBART WELDING, White All-Purpose Marking Pen, Part# 770222 US $6.43
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