Black Seal Paste

So I’m new to Chinese brush painting, and I can’t get this seal paste to work for me. But I’m also willing to consider it could be user error. When I go to tap the seal into the seal paste, it sticks to the seal so much that it doesn’t come away cleanly. It pulls away and leaves a long string, like taffy. I have mixed it with the stick it came with, and I have not added anything to the paste. I’m not sure if it’s the paste, or if it’s me. I’m considering ordering a different shade of red, and just trying again.

I was so happy to find black and white seal paste somewhere, and the service INKSTONE offered was extraordinary!
I had a mistake in my address and so the package was delivered to a wrong country. The mistake was totally my fault, but INKSTON was extremely helpful from the beginning and tried everything to get the package to the right address.
Extremly friendly and helpful! I wish every Shopowner would be like that! Thanks a lot!!

I tried mixing the red and blue paste to make purple, but it was far too dark without the addition of white paste as well. Minor fail on my part. It seems to me that non-traditional users like me might want more colors than are traditionally available. Just a thought.