;CONSTITUTION: An invisible ink contains, for example, pigment and a microcyanine color-fading coloring agent. The color-fading coloring agent is bluish but is discharged by emission of infrared beam. This chemical reaction is irreversible. Consequently, first, a bar code is printed using an ...
If the ink uses a particular chemical compound, you may need to use acid. It will turn the ink into a different color visible to naked eyes because of a chemical reaction. Furthermore, you can also use UV light because some inks will reflect a specific wavelength. 3. Secret Communication ...
invisible ink marking in a manner to distinguish it from the defined area remaining when the means for marking the sheet contacts one of the defined areas to determine the presence of the invisible ink marking which will visibly develop a preselected image to chemical reaction with the invisible ...
Make and Use the Ink Mix equal parts water and baking soda. Use a cotton swab, toothpick, or paintbrush to write a message onto white paper, using the baking soda solution as "ink." Allow the ink to dry. One way to read the message is to hold the paper up to a heat source, such...
A game ticket has validation data printed on the ticket substrate in invisible ink. The invisible validation data is capable of being irreversibly rendered visible by application of a developing agent
For application as a secu- rity ink, the components of that ink must be invisible under visible light as well as UV light. The printed mate- rial should not be photocopied and the code is readable under certain special conditions26. Highly luminescent Department of Chemical Sciences, Indian ...
The mask can be applied directly to the substrate and used in accordance with known photolithography techniques. Alternatively, the mask can be an ink mask stamped directly on the substrate surface. The application of the ink mask on the substrate can be effected at a stamping station. The stam...
method of recording this visible image may be arbitrarily selected from not only ordinary printing measures such as offset printing, relief-printing or intaglio printing, but also from known image forming technologies such as thermal transfer recording, an ink jet method or an electrophotographic ...