Picture of New simple method for corrosion PCB
By Ferric chloride hexahydrate can be very simple implementation of the diy pcb corrosion.

1. change all the shortcomings of ferric chloride, the corrosion rate is very fast.
2. It is blue and clear etching solution, no more dirty phenomenon.
3. etching process is clearly visible.
4. by 1:7 exchange water, can corrode 10 * 15cm single-sided PCB, about 10-15 pcs.

Step 1:

Picture of
by 1:7 'Blue etchant' into the water.
gcollins62 years ago
By the way, the etching agent is not blue: that colour comes from the Copper Sulphate that the reaction with copper produces.
lemonie4 years ago

I don't understand this - too little information. What is the blue stuff?

kingcm (author)  lemonie4 years ago
It is Ferric chloride hexahydrate.
lemonie kingcm4 years ago

Thanks, how does it change all the shortcomings of ferric chloride?
Ferrous would be blue, ferric is yellow/brown/orange - yes?

azigta lemonie3 years ago
The chemical name is Sodium Metasilicate, Anhydrous

THIS IS CONFIRMED BY THE COMPANY (KINSTEN) http://kinsten.com.au/chem/

The company is from australia, and the product name is DP-50
lemonie azigta3 years ago
And Kinsten have confirmed that this is blue?
There's no species in there that will produce a blue colour.

azigta lemonie3 years ago
i´m going to ask them, i´ll reply when I got the answer
kingcm (author)  azigta2 years ago
Hello,everyone. thanks for your interest.
The correct name is sodium Metasilicate or ammonium persulphate

http://www.kinsten.com.tw/KIN3.ASP?ITEM=H221 (australia)
http://kinsten.com.au/chem/ (taiwan)
http://www.digpcb.com (china)

Above address can confirm.
westfw kingcm4 years ago
> It is Ferric chloride hexahydrate.
Can't be. No such thing in that color (nearly clear.) Probably sodium or ammonium persuphate.
kingcm (author)  westfw4 years ago
Sorry, I may not know the correct English name of the item.
But in the Chinese market, most technology students use it for class experiments.

I will verify that the correct name. And then released.
gcollins62 years ago

Hi, I sent an email to the company Kinsten (www.kinsten.com.au) and got the reply that I pasted and put below in quotes. This answers many questions and corrects some of the statements.

"EB-750 (called Blue Etchant in some Asian countries) is Peroxydisulfuric acid, disodium salt. To the commentors that said it was low at room room temperature, nether EB-750 or Ammonium Persulphate will work effectively at room temperature, and needs to be heated to about 55 deg C to be effective.

DP-50 is the developer, and it is Sodium Metasilicate."
DP-50 removes the exposed photosensitive film from the board, it does not etch copper.
Hi, I have one question, what is the diference betwen Ferric chloride Hexahydrate and the normal Ferric Chloride (FeCl3) because what I have is a dark brown, almost black liquid and hell it is slow!

can the hexahydrate version be made from this or what is it?


BTW 5 stars!
Hi. Make sure your FeCl3 is fresh and no yellow lumps are present. And it does not matter what type of FeCl3 (anhydrous or hydrated) you use. To make the etching process faster, use hot water. It works like a charm.
gaudat3 years ago
Found exactly this in a local electronics store here in Hong Kong.

It's ammonium persulphate, priced at HK$20 (about 3 usd) per pack.

Slower than ferric chloride, and have quite serious side-etching.
I think it is not so appropriate if you want to have SMD components on your board :)
I tried ammonium persulphate, and don't work for me(I tried in room temperature)
azigta3 years ago
The chemical name is Sodium Metasilicate, Anhydrous

altomtom4 years ago
Kinsten Presensitized PCB Board environmentally friendly Blue etchant 190g/bag
altomtom4 years ago
kingcm (author) 4 years ago
i'm sorry!
I tried to contact the factory. They can not provide a true chemical name.
At present, China and Taiwan are described as "Blue etching agent" or "藍色環保蝕刻劑"
Udon kingcm4 years ago
Hey Kingcam - ni jiang zhongwen ma?
Zhege dongxi yong zhongwen zenme shuo?
Ni gei wo pinyin jiu haole.

Wo youshihou wei wo xuexiao la yixie huo dao nanfei. Tamen zai fazhan zijide etching lab.
muangau4 years ago
Give us in full chemical name would be much better to understand.
Also where can we get it, supplier name.
mathieulj4 years ago
Quite sure this is in fact Ammonium Persulfate. This instructable contains very little information, perhaps a slideshow would be better.