Suture packaging is required to be colour coded so you are able to match the resorption process (or absence of), with the wound healing process.

What color are non dissolvable stitches?

Non absorbable stitches are usually coloured, either black or blue. Non absorbable skin sutures require removal at 10 days post op. The thickness of the suture depends on a number of factors. These include the thickness of the skin, surgeon preference and location of the wound.

What type of sutures are black?

Black Braided Silk is a non absorbable multifilament surgical suture of animal origin, and has a silicone coating which limits the absorption and minimizes tissue reaction. This absorbable suture is composed of natural protein fiber produced by the silkworm.