An curved arrow pointing right. Following is a transcript of the video. Narrator: Cutting kinetic sand reveals rainbow colors hidden inside. Sand.tagious is a popular sand-cutting Instagram page.

This work established upper limits on the number of colors required to ensure that any two vertices can be separated by a rainbow cut, which is a cut where no two edges share the same color.

However, at times, a rainbow-like sheen appears on their surface, resembling petrol stains. What does this indicate, and is such a cold cut safe to consume? Some cold cuts, whether in bulk or ...