This is a little harder than just yes or no. For the most part the military uses black ink because it copies better and faxes better. However the commanding officer of a unit will usually use red ink so that anytime you see something in red you know it was written or signed by the commanding officer. The executive officer (number 2 in command) uses green ink and the operations officer in some units uses blue.
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i think ink like pens markers and paint
Yes, there is a Mongol ballpen, available in 3 colors, black, red and blue. I bought a set from SM Megamall, ground floor, school and office supplies section. Try to check other bookstores as well such as National Bookstore. However, I haven't been there these days.There are 3 variants, the first one has a yellow casing with a black cap, quite similar to the Mongol pencil's color and a black cap, the second one has a clear casing, and the third are retractable with yellow casing.The first variant writes smoothly which I really like. Its ink is similar to Parker pens so I bought a lot of them. One set costs nineteen pesos only. (P19.00) A pack contains three pens. They are very affordable.The rest of the variants are stylish and they have finer points. Thank you very much Mongol for making these fine-quality pens. I hope Filipinos would keep buying them too just like the Mongol pencils.
it was made of charcoal and water.
secret ink
The regulation of banning invisible ink to letters abroad was banned so that enemies could not communicate. This was enabled as it stopped people writing secret messages to one another about the tactics the United Kingdom had during the war.