Comments on My Rambling on the 'net: Bye Bye Ferric Chloride...

Jurukaka, Care to explain the health hazard of hyd...

2009-09-01T08:32:26.789+08:00

Jurukaka,
Care to explain the health hazard of hydrogen peroxide?
My search so far show that it is safe (even as mouthwash) at low concentration (which is much higher than 20ppm).
Here a link I found that links to many other.
http://answers.yahoo.com/question/index?qid=20070613185108AAOiDpQ

Last my patient death cause by hydrogen Peroxide.....

2009-08-29T13:30:55.265+08:00

Last my patient death cause by hydrogen Peroxide... exposure more than 20ppm also can coz cancer in short term.

so hati2... last case in Kuala Selangor (6 death)also expose to very2 low concentrations in short term. Cancer? owh.. google ;)

;)

Just my 5 cent.

I finally found what I was looking for whenwe we l...

2009-08-29T01:42:06.723+08:00

I finally found what I was looking for whenwe we looking for the Hydrogen Peroxide.... they tried to sell me 1kg.. I said I dont need that much.. just about 20-30gm aje... :)

The hydrogen proxide is from normal pharmacy-- RM1...

2009-08-28T08:31:26.050+08:00

The hydrogen proxide is from normal pharmacy-- RM11 for 450ml.
Not sure which hardware shop sells the muratic acid but at Ace Hardware, it cost around RM10 for 1 bottle (~950ml).
Read my update, I need to do some more testing... :-p
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Assalamualaikum Bro ,Selamat Berpuasa, Hehehehehe ...

2009-08-27T18:08:19.421+08:00

Assalamualaikum Bro ,Selamat Berpuasa, Hehehehehe ,thanks for the info's guru and one more kat maner boleh dapatkan that kind of chemical's used, kat hardware shop here none of them sell it, how much is it and ur phone no bro, Thanks

Hello 9w2gu, Yes, etch oredi but with fresh solut...

2009-08-27T14:03:12.026+08:00

Hello 9w2gu,

Yes, etch oredi but with fresh solution lah. That's why the solution is green. Solution was clear when first mixed. It took only 2 minutes without bubbling... yeaaa...

The etch tank is the same size as my old container but taller to prevent splashing...

Hazardous? No idea, but I read somewhere that after mixing the acid is around 3 molar... No acid burns so far... :-)

Last for eternity? Also no idea. Not much PCB making lately so cannot really test the solution longevity. Will update on how well it stores later.

Have you tried etching? how much faster is it? Is ...

2009-08-27T13:27:32.947+08:00

Have you tried etching? how much faster is it? Is solution after mixing still hazardous, caustic? This time your etch tank is bigger than my UV box...hi..hi...;-)

Asm bro, Selamat Berpuasa. Simple jer. 1. Pour 1 ...

2009-08-27T09:51:35.950+08:00

Asm bro, Selamat Berpuasa.

Simple jer.
1. Pour 1 bottle (450ml) of H2O2 into PLASTIC container.
2. Add 300ml of muratic acid.
3. Mix thoroughly and let it settle. Do not close the container as the reaction will produce some gas.
4. You're ready to etch!
5. After SEVERAL etchings, the solution will become dark green and later brownish.
6. That's when you need to add oxygen. You do that either by air bubble (aquarium air pump) or by adding some H2O2.
7. When it become hard to re-green the solution, add some more muratic acid.

Since I use the air bubbler DURING etching, I need not do step 6. I only do step 7 as needed.

Assalamualaikum bro, saya agak keliru sket ttg cam...

2009-08-27T08:58:35.139+08:00

Assalamualaikum bro, saya agak keliru sket ttg camner nak gunakan kali kedua solution nie, dan bagaimana pula nak masukkan oksigen tue, can you describe more, dan ur phone no please, Thanks bro