Do not use a fountain pen since this ink could run into your invisible ink and make it visible. Write another (not secret) message on the paper with ballpoint pen, pencil, or crayon, so it doesn’t appear to be blank and meaningless.Paintbrushes (and/or straws, cotton buds).Lemon juice, developed by 0.1 M iodine solution.corn starch or potato starch), or by 0.1 M iodine solution M iron sulfate IRRITANT, developed by 0.1 M sodium carbonate, 1% starch solution (e.g.0.005 M lead(II) nitrate TOXIC, developed by 1 M sodium iodide.M copper sulfate, developed by 1 M sodium iodide, 0.1 M sodium carbonate, or 1 M ammonium hydroxide.1 M sodium chloride (table salt), developed by 0.1 M silver nitrate.1 M sodium hydrogen carbonate sodium bicarbonate (baking soda), developed by grape juice.Ammonia(1 M ammonium hydroxide) developed by red cabbage water.Vinegar or 1 M acetic (ethanoic) acid, developed by red cabbage water.Thymolphthalein HIGHLY FLAMMABLE & HARMFUL, developed by 0.1M sodium carbonate (or another base).Phenolphthalein (pH indicator) HIGHLY FLAMMABLE & HARMFUL, developed by 0.1 M sodium carbonate (Solid is IRRITANT – solution is LOW HAZARD) (or another base).Many of them work as pH indicators, so when in doubt, paint or spray a suspected message with a base (like sodium carbonate solution) or an acid (like lemon juice). The paper can also be placed directly onto the hotplate on a low heat but greater care must be taken because it is more likely to burn this way if not supervised carefully. This is a reasonably safe way to heat the paper without risk of burning and it works well to reveal the message. The paper containing the message can be placed onto a white (ceramic) tile and the white tile can then be placed onto a hotplate. An easy way to reveal these types of messages is to iron the paper gently. Most invisible inks are made visible by heating the paper. Avoid using lined paper to write your invisible message, for the same reason.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |