The scientific name for it is Cyanotype
the fabric or paper is treated with a mixture of two chemicals which make it light sensitive. After exposure to light , sunlight works the best, it changes color from a light green to a dark muddy blue,s color. You rinse it in cool water which sets the color and you will see it change to a brighter blue. It is a still sensitive to phosphates ie. soaps so it can only be washed in water.
|Star fish Quilt close up |
beading in progress
Sew I hope this helps to explain blue printing a little better
there is also a site that you can order the treated fabric from called....