Xstamper Secure Stamp Ink Refill | Shachihata Secure Stamp Ink Refill Xstamper Secure Stamp Ink Refill | Shachihata Secure Stamp Ink Refill This block out stamp ink is only available in Black ink. Secure Stamp obscures private information including bank account numbers and signatures. Perfect for bank statements, mail, legal contracts, prescriptions and magazine labels. The 10ml Xstamper Secure Stamp Black Ink Refill works with S10 and S18 models.