We've just had a fireplace (for a woodburner) rebuilt & had asked the builder to repoint with mortar that would dry a light colour (was previously lime mortar). It's come up darker than we'd hoped - is there anything we can put on it to lighten the colour (e.g white blackboard chalk?) that would be heat resistant? Many thanks!
You could always use heatproof paint or try a selection of coloured chalks Tom but in all honesty its a whole lot better to rake out the mortar and start again. There is a page on the website about matching mortar colours and we suggest in this page that you mix a little bit first and leave it to dry so you can be sure of the colour before you "attack" the brickwork. See https://www.diydoctor.org.uk/projects/Matchmortar.htm
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