Employ a worthy paintbrush.
Invisible inks hold been used for some future in espionage, anticounterfeiting and security roles. Many assorted types of invisible inks exist, on the other hand some are visible under a inklike (and called UV, or ultraviolet) brilliant. Within this type, some inks Testament either repercuss UV ablaze and fluoresce under a black light while others Testament absorb the UV illumination and not fluoresce; these later inks will come out darker when presented on fluorescent paper under UV light.
Note that at this stage, unless your black light is already on, the message will still be invisible.3. Turn on your black light and place your writing underneath the light. Your message is now visible.
Petroleum jelly is effectively a ready-made black-light invisible ink.
2. Apply a small quantity of your invisible ink to your writing surface of choice using a fine paintbrush. Try writing a "secret" message.
