Thank you all for the responses, it appears that as the ink Sensient Octoink are of good quality, I will try to make an order and see that such octoink, gray ink also available with Sensient thing is not so.
Another question then it is better to ask KMP pigmented black ink or Image Specialists...
Hello, I am writing from Spain, here I found Sensient inks Moorin but reading and see that it may be best option for providing Optoink example, what would you recommend? I need the highest quality.
thank you very much.