How to make Hot Ice?

All you need are two common kitchen ingredients to make hot ice - a non-toxic chemical that crystallizes when you touch it into a material that looks like ice except it gives off heat. See how to make hot ice and get ideas for fun hot ice activities.

You Will Need :

• White Vinegar
• Backing Soda

Process :

          Mix one liter of vinegar with 4 tablespoons of baking soda. These chemicals react to form nontoxic sodium acetate or hot ice in water. You need to boil off most of the water, so heat the solution until it is boiling and keep applying low heat until you see a crystal skin start to form on the surface of the liquid. Remove the hot ice solution from heat, pour it into a new container and refrigerate the solution until it is chilled.

          When the hot ice has cooled, you can get it to instantly crystallize simply by touching it. You can try crystallizing the hot ice as you pour it, too. Either way, the solution will give off heat as it crystallizes.

          You can re-dissolve and reheat the hot ice to play with it again or you can throw it away when you are finished. 

          I hope you've enjoyed making hot ice.

By: Unknown On 10:44 am

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How to make Fake Fingerprints?

Courtesy: Gujranwala Science Club

NOTE : The post is only for educational purpose. I'm not responsible for ANY misuse of this post.

In order to fake a fingerprint, one needs an original first. Latent fingerprints are nothing but fat and sweat on touched items. Thus to retrieve someone else's fingerprint (in this case the fingerprint you want to forge) one should rely on well tested forensic research methods. Which is what's to be explained here.

Process :

Find some good counterfeits. A good source of originals for our counterfeits are glasses, doorknobs and glossy paper. The standard method of forensic research makes them visible: Sprinkling it with colored powder, which sticks to the fat.

Try something related to superglue. Another solution involves Cyanoacrylate, the main ingredient of superglue. A small amount thereof is poured into a bottlecap, which is then turned upside down and put over the fingerprint. The Cyanoacrylate gasses out and reacts with the fat residue to a solid, white substance.

Get a digital reproduction. The further treatment involves scanning/photographing (Figure 5) and a bit of graphical refurbishment. The goal is to get an exact image of the fingerprint, for further use as mold, out of which the dummy is made. The easiest way is to print the image on a transparency slide (the ones normally used for an overhead projector) with a laser printer. The toner forms a relief, which is later used similar to letter press printing. Wood glue is suitable for producing the dummy.

Use a small dash of glycerin to optimize humidity and workability. After thorough mixing, the dummy gets coated with a thin layer of the compound.

After the glue has dried (Figure 10), pull off the foil (Figure 11) and cut it to finger size.

Glue the counterfeit to your own finger. Theatrical glue is used to glue the dummy onto the own finger. The new identity is ready!

By: Unknown On 10:22 am

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