Home / Science & Technology / The Secret Science of Covert Inks You cannot add "Electrical Properties of Biological Polymers, Water, and Membranes" to the cart because the product is out of stock. The Secret Science of Covert Inks Samuel RubinPort Townsend: Loompanics Unlimited, 1987.First Edition. . Fine Condition. $45.00 AUD 1 in stock The Secret Science of Covert Inks quantity Add to cart Add to WishlistOn your Wishlist - View List Add to Wishlist SKU: 0010828 Categories: Humour, Science & Technology