Revealing Fingerprints With Silver Nitrate

Revealing Fingerprints With Silver Nitrate

Another Method from the same chemistry book.

Weigh 0.3 grams of AgNO3.

IMG_20140101_080537

And pour it into 10ml of distilled water.

IMG_20140101_080629

I sprayed it and I shone it with an LED lamp (a UV lamp is better).

IMG_20140101_080832

Now I got this:

IMG_20140101_234810

I didn’t know why it was a line like that, but it worked.

IMG_20140101_234852

I didn’t find any other fingerprints and the fingerprint that I have is hard to see.

Well, this experiment is considered as a fail. I rather use the iodine fuming method that I used the last time. The silver nitrate reacts to the salt on the fingerprint and produces silver chloride, just like on the skin.

 

13 Replies to “Revealing Fingerprints With Silver Nitrate”

  1. Ah yes a UV light would give quite a different image.
    And a surprising number of things have been discovered quite by accident, by people doing experiments and looking for something else! 🙂

    Liked by 1 person

  2. I think the problem is the lamp. I used a regular LED lamp, but UV lights are better. I can use sunlight but since it rainy everyday, no sunlight. And you’re right, trial and error. You just need to find the problem, fix it, and the experiment will work 🙂 Thanks for teaching me 😀 That’s why it’s “experiment”.

    Liked by 1 person

  3. Most experiments are trial and error. Sometimes they work, sometimes they don’t, but either way you learn something. 🙂
    Maybe silver nitrate works better with finger prints on glass or something. 🙂

    Liked by 1 person

What's your Opinion?

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: