Gold in Digital Pregnancy Test?

[Darkness Falls]

Hello all,

I'm still lurking and saving up my scrap until I have the proper knowledge to process it. I did have a question though. Does this look like gold plate to you guys? I don't have any testers right now. It was the contact point for a silver oxide battery inside of a digital pregnancy test.

 

[butcher]

I cant say if it is gold without testing.
My question would be, was the pregnancy test positive, if so that baby will take some gold to raise. :lol:

 

[Darkness Falls]

I cant say if it is gold without testing.
My question would be, was the pregnancy test positive, if so that baby will take some gold to raise. :lol:

Lol, yes it was positive. We are officially 19 weeks today! Doctors are saying August 1st due date so I'm running out of time to scrap!

 

[Harold_V]

Congratulations on the child.

My opinion? The contact is not gold. It's too discolored to be.

A single drop of nitric acid applied will reveal the truth. If it's gold, it will brighten. If it's brass, as I suspect it is, there will be an instant reaction, resulting in a blue solution and a dull yellow surface produced where the acid was applied. If it is gold plated, the nitric will penetrate, but it won't be instantaneous as the reaction is if it's brass.

Harold

 

[g_axelsson]

I would suspect it to be gold, but as Harold said, a single drop of nitric is all you need to see the gold foils float away.

Brass would easily tarnish and it would be very hard to put down onto a circuit board. One of the standard surface treatments on modern boards is ENIG (Electroless Nickel Immersion Gold) and that is putting down a very thin layer of gold on top of a thicker nickel layer. As the pattern is full of holes the total surface is tiny and only contains minute amounts of gold. Throw it in with fingers when running the copper chloride process and you can collect the gold at the end.

Göran

 

[FrugalRefiner]

Very insightful butcher.

Congratulation Darkness! Time to start putting that gold away in the college fund. :lol:

Dave

 

[Darkness Falls]

Thanks for all the help everyone! I still haven't purchased any chemicals yet. For now, I'm just studying. it looks like Nitric Acid will be the hardest chemical to find, at least cheaply. I know I can make my own but that's something else I want understand completely before attempting. Well, back to saving my scrap and reading!

 

[MarcoP]

Ah ah, congrats for the baby!
I timed the contractions, helped pushing, I was the first to see both of children, I cut their cord, made their belly button and they had the first sleep with me. Those were the most important days of my life and I wish the same joy for you. The only think I don't wish you are the nail scratches on your arms as I had :roll: