I recently purchased a batch of ink samples from Goulet pens, one of which was the konpeki color. I have tried it in my clean pilot metropolitan and the color was beautiful. The next day I try the pen out again and to my surprise, the color has turned from a beautiful light blue to a nasty dark grayish blue. It is completly different. I tried to write for a bit and it lightened up a little bit, but is nowhere near its previous color. Does anyone know what could have happened, and what I could do to prevent this?