Hi. Can anyone help me. I'm looking for a way of testing if theres lime in my mortar mix. Its a long story. Had the front of my house re plastered. It's an old stone wall building. Unfortunately when the builder fitted new window sills, he didn't put enough of a tilt in them. So another builder has told me they need re doing. And that my property should be a lime rendered, and not concrete render. Is there a way to test of there's lime in the mix. As 1 builder is telling me there is, and the other is saying there isn't and needs lime to allow the property to breathe. It's been done using Hanson multicem cement. Any info would be appreciated. Thanks in advance.