Slight correction: Prussian blue is NOT considered water soluble. In its microcrystalline form it can form a “colloid” not a solution
Also, the dye “indigo”, natural or synthetic is the predominantly used dyes to make blue jeans.
Prussian blue can be used to make fabrics blue, but is mostly used in paints, inks, blueprints, laundry bluing.
Because it is a colloid it can eventually wash out
FYI
Jeans were history dyed with it here and it’s nature was exactly the reason old jeans faded faster. Way before acid washed and synthetic indigo took over. Jeans in India and other places concerned with cost still use PB as it’s cheaper if not as durable as indigo dyes.
Literally the first sentence.
“Prussian blue (PB), a well-known pigment used to dye jeans, has been recognized as an emerging material for next-generation batteries. A team of researchers, led by Professor Hyun-Wook Lee in the School of Energy and Chemical Engineering at UNIST has made a significant breakthrough in the development of low-cost, high-performance lithium-ion batteries (LIBs) using PB, leading to significantly reduced battery prices.”
This also highlights how close lithium and sodium are and ionic chemistry the fact that most sodium ion batteries use this already for their cathode and now they’re going to use it with lithium just shows how close they are.