Ranok-Creative Burning Iron Experiment Kit

Product description from producer

Invisible ink is a kit for experiments. An inscription will appear on the white sheet! Have you long dreamed of becoming a super agent? Then you must be able to write and read encrypted messages. In this experiment, you will be able to create your own spy invisible ink. The set contains: cobalt chloride, a measuring cup, a cotton swab, a writing sheet, protective gloves, step-by-step instructions.