Color separation in selenium ink

inks
piezography

#1

I just noticed something in one of my 700ml bottles of selenium shade 4 (seeing it in shade 2 bottle too) that the top empty area is turning bright blue. I know that the inks need to be shaken from time to time and I always shake the bottle gently before filling carts, but have never seen this before. I have a photo of it but it will not take it as an attachment to this post.

Is this something I need to worry about, like inconsistent color(s)?


#2

Not to worry as long as you keep the ink shaken. You are witnessing thin layer chromatography, one of the color pigment base has a different bleeding speed (migration) on the plastic HDPE bottle. This is why you saw the blue color around the plastic bottle. A chemical we used to use is no longer available and the new chemical which actually gives us better encapsulation advantage and print head performance causes a more perfect separation of the components. So just keep the ink shaken from time to time.


#3

OK, I was worried I would only be able to print photos of Smurfs soon.