Chalk Blocks from Perham Down and Larkhill

As part of the continuing development of RTI, and to build on knowledge of how to apply this technique on various sized objects and materials, it is important to compare, where possible, as many different types of surface marks as possible. In this case an opportunity arose to apply RTI to two chalk bocks recovered from two separate excavations, from a similar period but with two different surface treatments. The chalk blocks were obviously the same material with similar surface patina; they had been worked at approximately the same time but, one was carved with relief and one had applied pencil marks.