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Weld creates a bold yellow color and is the most light fast of the yellow dyes. Here are some basic instruction for using Weld but we also offer the complete Earthues booklet which is a complete reference for natural dyeing. Use 1% to 4% for light to dark yellows. Develop bright egg yoke by adding calcium carbonate (Tums tablets) to the dyebath. Use one tablet per gallon of dyebath. Or you can put yarn in an 8% Ammonia postbath. Use tepid water and immerse the goods in the solution. You will see the color change in 20-30 minutes. Remove, rinse and extract excess moisture. This Yellow is very lightfast and used by ancient tapestry weavers in india.