"Sharp demarcation" refers to a clear and distinct separation or boundary between two things or entities. It suggests that there is a noticeable difference or division between them. Full definition
However, resinous color strata would never bear such sharp demarcations. (artillerymag.com)
Since the theologian may, in fact, be quite independent and original, and since the philosopher may in fact recognize that some of his ideas arose from a culture deeply influenced by a particular community of faith, no sharp demarcation is possible. (religion-online.org)
The differences in these collected works come out of the handling of materials, whether clean and exacting with pure color, a sharp demarcation of elements, or transparent and loose with areas of paint bleeding over / into others. (painters-table.com)