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URL:https://www.learndesk.us/class/5941362048368640/lesson/0d40ea56af4e4236809fe2c05386eab1?ref=outlook-calendar
SUMMARY:Mordanting with Alum
DTSTART;TZID=America/Los_Angeles:20260405T190000
DTEND;TZID=America/Los_Angeles:20260405T200000
LOCATION:https://www.learndesk.us/class/5941362048368640/lesson/0d40ea56af4e4236809fe2c05386eab1?ref=outlook-calendar
DESCRIPTION: 
Timeline: one-hour preparation, ready immediately, store indefinitely 
Materials: nonreactive pot, burner, thermometer, alum, cream of tartar*, water
Aluminum Potassium Sulfate (or Aluminum Sulfate) is the most common mordant that dyers will use today. It doesn’t leave any color on the fiber and it will brighten many colors when dyeing. It is most beneficial on protein fibers, though with a tannin base it may do well on cellulose fibers. You may choose to skip ahead and prepare your cellulose fibers first in a tannin bath, then return to this section to mordant them in alum. A benefit, other than the shorter preparation time, is that you may store your fabrics after mordanting before dyeing. The timing is debatable, saying you have a limit of 3-6 months to dye the fiber to “indefinitely.”

Bring water to boil
Add Alum at 12% WOF, and optionally Cream of Tartar at 6% and allow to dissolve. (100g will require 1T alum and 1.25tsp CoT)
Add wetted fabric
Hold at 180°/ 82°C for 45...

https://www.learndesk.us/class/5941362048368640/lesson/0d40ea56af4e4236809fe2c05386eab1?ref=outlook-calendar
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