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Thursday, July 28, 2011

Cochineal, Logwood and Rhubarb update

Sorry this has taken so long.
First the rhubarb leaves.  The ones that were drying ended up rotting and stinking so they went in the trash.  I still have the frozen ones, the extras in the trash bag went in the trash as well.  When I use the frozen ones I will update again about how well that works.

Here are the results of the logwood.
This is what the pot looked like the next day.

Here are some hanks just pulled from the pot.

Here they are after rinsing.  You can see how the color lightens.  I thought they were all going to be black.

You need to rinse you logwood really well if they dye bath wasn't strained really well.

Here they are on the line to dry.

Here is a close up of the copper mordanted fiber.  Nice color.

Here is my cochineal on the line, curing.  There are some experiments on the end that turned out nicely.

The cochineal took some extra effort to wet out before modifying.  As you can see the water just sits on the surface of the wool.  So the water had to be squeezed into the fiber.

So as I mentioned, the next step is modification.  This is where the color is changed by placing the yarn into a solution of either acid, such as vinegar or using citric acid, base, such as washing soda or ammonia, or other modifiers like copper or iron.  In this picture I have a hank from each mordant from the rhubarb, logwood and cochineal in a ammonia solution.  I used about 1 cup in the 2 gallon roasting pan.

Below are pictures of each yarn after all modifiers have been applied.

Logwood
First 5 are mordanted with alum.  The first one is not modified.  The second is modified using copper, third, iron, fourth, ammonia, fifth, citric acid.
Next 5 are mordanted with copper.  Modified as above.
Next 5 are mordanted with iron.  Modified as above.
Last 5 are mordanted with tin.  Modified as above.

Rhubarb is like the logwood, but hit or miss.  Remember this one was all experimental.

Cochineal is the same as the logwood.

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