Video:

Natural Dye Basics: Preparing Your Yarn; Myra Made Color: Shows how to create two different kinds skeins for dyeing and then how and why to scour.

Natural Dye Basics: Mordanting; Myra Made Color: Demonstrates using Alum to mordant wool yarn for dyeing.

Natural Dye Basics: Dandelion Dye; Myra Made Color: Demonstrates actual dyeing with dandelions, which can be transfer to many other plant dyes.

Create a Natural Dye with Onion Skins; Myra Made Color: Steps to dye with onion. Uses different fibers to show variations from same dye pot.

Articles:

Mordants and Fixatives; This article lists various mordants and fixatives that can be used with natural dyes.