A Dead Silk Runner can be Boiled in a Clay Pot or Copper Pot to make a Tuft of Spider Silk or rarely Spider Egg Sacs. This item needs about 30 minutes to Boil.
When picking up an Abandoned Cobweb or Dead Silk Runner there is a small chance to receive a Bug in a Blanket. Right-clicking and selecting Release on a Bug in a Blanket will give you another Abandoned Cobweb and a Beetle, or a rarely a Ladybug, or a Giant Willow Aphid.