Formula for Durable Ink.
How to make durable ink Is another great secret we have lost. Look at any letter five or ten years old and you will probably notice that the writing has faded to a brown color and is very indistinct. Go to any big museum, and you will find ancient manuscripts, the writing of which is as black and distinct as if the manuscript were written the day before yesterday.
The secret of glass blowing and tinting is not yet entirely lost; there are still a few men who can produce glass-work equal to that which the ancients turned out hundreds of years ago.
But the average glass manufacturer cannot produce anything that could at all compare with some of the commoner articles the Egyptians, and, later, the founders of Venice manufactured; and those who still hold the ancient secret guard it so closely that it will probably die with them and be added to the long list of things in which our ancestors beat us hollow.