I used leftover natural blue food coloring (made with red cabbage and baking soda) to make some print samples.
I used a fork to print mini polka dots and a pattern which looks like rain.
The color was dark green before I washed the fabric. (The 3D dots are made with leftover frosting which was also colored with natural blue food coloring – but the fabric was white after washing, the turquoise was gone.)
The dye isn’t very washfast, it bled while washing the fabric with lukewarm water.
Once the fabric is dry, the color is light teal.
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What an interesting experiment. Not ideal for something that needs washing but it might be fun to make some art work maybe.
You can make a washfast and lightfast blue dye with red cabbage if the fabric is mordanted with iron liquor.