The limestone fireplace in the guesthouse is in a poor state, full of holes, chipped stone and discoloured with a black tarry substance. I decided to fill the holes with a homemade lime putty of lime and water. It worked OK for the small holes but in the larger holes the putty shrank and just fell out. It would have been better to make a stone substitute out of lime and water and silver sand. Silver sand is a very fine white sand, it's often used in kids sand pits, rather than the courser yellow builders sand. The sand bonds with the lime to make a better solution. Nevermind, after filling I gave the stones a limewash and now I just need to hand sand with a fine grade to remove the brushstrokes.
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