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Safe DIY PCB etchant

Hello out there, I was wondering if anyone knew a safe, homemade PCB etchant other than the vinegar and hydrogen peroxide method. That produces copper (II) acetate and I don't have any use for it other than copper plating, and I suck at electroplating anyways. I would like to find a safe, homemade copper etchant that is easily disposed or can be reused for something.  Thanks, Sam.

Question by DELETED_JesusGeek    |  last reply


My Hydrochloric acid and Hydrogen peroxide etchant goes red without any copper in it. How come?

I recently tried making acid cupric chloride etchant; however, my batch always goes a darkish red colour as soon as i mix the two together even when i haven't added any copper. I've been using 3% hydrogen peroxide from a pharmacist and 30% HCl From Bunnings. All the stuff was fresh and in dark plastic bottles. The container i put it into is plastic. It still etches but it's nearly impossible to see if the copper is etched away without pulling it out. Can anyone tell me what's in the mixture that's making it red and how i can correct it. Thanks

Question by Lost in Translation    |  last reply


Can regular bleach be used as an alternative for PCB etching?

I just want to know if there are any chemicals that would be easier to get a hold of than having to go out and buy the ferric chloride or other etchants.

Question by PyroMonger    |  last reply


Is There an Etchant-Resist That Can Be Left On PCB As Insulator?

Howdy is there a kind of resist that can be left on the pcb after etching (except the solder points), as an electrical insulator? can it be used with the photo-etching method, or only heat? thanks

Topic by johnyradio    |  last reply


I am going to use the hydrochloric acid etchant solution to make some jewelry. What works best as a RESIST?

I would like to be able to draw a picture with something then etch.

Question by lbaker    |  last reply


The best way to reverse staining by copper etchant in a stainless steel sink?

So I used some of the copper etchant in aqueous solution stuff (instructables example) and a couple drips got onto my sink. I was thinking there might be two ways to minimize the appearance of these stains: 1. Could I just dremel the very surface off with a fine sandpaper/stone? 2. Could I use electrolysis in a small area to try to at least pull the copper off the sink? There is some dark staining which I assume is some acid that ate through some of the steel, but the copper is the most obvious problem. I doubt there's a good method to remove what I assume is the acid staining other than trying the dremel.

Question by shmolky    |  last reply


Error when downloading PDF of "Stop using Ferric Chloride etchant! (A better etching solution.)"

I get this error when clicking the download button on this: https://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant%21--A-better-etc/ happens with  Chrome and Firefox on Windows 7 (note other downloads work fine) ---------------------------- (function(){var c=0;if("undefined"!==typeof CustomEvent&&"function"===typeof window.dispatchEvent){var a=function(a){try{if("object"===typeof a&&(a=JSON.stringify(a)),"string"===typeof a)return window.dispatchEvent(new CustomEvent("lprequeststart",{detail:{data:a,requestID:++c}})),c}catch(f){}},b=function(a){try{window.dispatchEvent(new CustomEvent("lprequestend",{detail:a}))}catch(f){}};"undefined"!==typeof XMLHttpRequest&&XMLHttpRequest.prototype;&&XMLHttpRequest.prototype.send;&&(XMLHttpRequest.prototype.send= function(c){return function(f){var d=this,e=a(f);e&&d.addEventListener;("loadend",function(){b({requestID:e,statusCode:d.status})});return c.apply(d,arguments)}}(XMLHttpRequest.prototype.send));"function"===typeof fetch&&(fetch=function(c){return function(f,d){var e=a(d),g=c.apply(this,arguments);if(e){var h=function(a){b({requestID:e,statusCode:a&&a.status;})};g.then(h)["catch"](h)}return g}}(fetch))}})(); (function(){if("undefined"!==typeof CustomEvent){var c=function(a){if(a.lpsubmit)return a;var b=function(){try{this.dispatchEvent(new CustomEvent("lpsubmit"))}catch(k){}return a.apply(this,arguments)};b.lpsubmit=!0;return b};window.addEventListener("DOMContentLoaded",function(){if(document&&document.forms;&&0 AccessDenied Access Denied 07BB2BDF001C8E39 UNsh+3Qc6mUeOnVk7FiMOvXWaiu+9vpA24ZxkR6/TCCRjKqR0A9UsViskbkpNlWgADghstM9XYo=

Topic by newline    |  last reply


What do I do once I mill a pcb? Answered

Should i use an etchant after milling a pcb with a CNC ? I am trying to learn how to use CNC to engrave PCB. Please help.

Question by kunchu    |  last reply


PCB etching left over paper

Hey everyone! I'm in the process of etching my first PCB. I have a few questions. I'm using the toner transfer method, with hydrochloric acid and a little hydrogen peroxide as an etchant. Anyway, I transferred the toner to the board, but I believe the glossy paper I used may have been a little too thick. The toner transferred correctly, but i can manage to get all of the paper off. I've tried a tooth brush and a soft towel. My question is, if I just go forth and etch the board will the paper dissolve with the copper on the board and give me a clean result anyway? Will the copper covered by the paper not be removed? are there any cons to this? (such as not being able to reuse my etchant) Thank you all, your help is appreciated Ken

Topic by KennyW2    |  last reply


are there toxic vapours produced from using ferric chloride to etch pcb boards? Answered

Are there toxic vapours produced from using ferric chloride to etch pcb boards?  I want to present this process in a classroom but there are no windows and wondered if this would be hazardous. There's also the method of mixing hydrochloric acid and hydrogen peroxide to act as an etchant. Thanks!

Question by williamhaze    |  last reply


Copper chloride without H2O2-adding?

Hi! I think i will see some PCB-Etchin in the future... So i will need an etchant. Aequous copper chloride was the choice i made since it is a regenerative etchant according to several sources. Now if i understood the chemistry right (Sorry... electrotechnician here), the reaction in theory only needs the oxygen from the peroxide (H2O2) and the hydrogen isnt used at all? Since i only have relatively weak peroxide, i plan on using a bubbler to introduce the oxygen to the copper-HCI-mix. This because i dont want to dilute the acid too much... Will that work? I know that if i use normal air (which has only around 20% oxygen in it) it will take some time... But would it work in the first place? I read somewhere that copper and muriatic acid dont really react in the first place... So if i also understood that right, it needs the oxygen present in the beginning to START reacting... So i think i may go with a contraption like: Plastic container with a bubbler installed (Pumps normal air) Add Muriatic acid to the container Add copper to the acid let it bubble till the copper is disolved Now i have a copper chloride-solution which i can regenerate by adding oxygen (By bubbler or H2O2)?  

Topic by Orngrimm    |  last reply


Removing chlorides from a solution to leave only metallic copper?

I'm trying to deposit metallic copper into a piece of wood and i'm doing it with a solution of copper chloride (the alternative pcb etchant to the ferric stuff). I want to deposit metallic copper into the wood where it has soaked in and remove the chlorides altogether. Bearing in mind that i don't want much in the way of another solution, how could it be done? Could I drop in some lead to precipitate out the chloride ions or is there something else that would steal the chloride ions from copper that wouldn't be too hard for a hobbiest to obtain?

Question by The Ideanator    |  last reply


Best way to clean an etched stain in laminate countertops? Answered

So I used some of the copper etching solution of HO and HCl and some of it accidentally spilled on my bathroom countertop (I think it's laminate, one of those veneer things). I didn't think it sat very long, but now the area where it sat is distinctly lighter. What's interesting is that if I wipe it down with water, it becomes "normal looking," but as soon as it's dry, the lighter stain comes through again.  Anyone have any suggestions? Is this something that can be absorbed or cleaned off? Or is there a solution you can use to darken a countertop?

Question by shmolky    |  last reply


Can I etch a PCB in the winter...? Answered

I want to etch a PCB, but it is rather cold where I live. I had settled on the HCl/Peroxide mix, but I could use something else if need be. I wouldn't be worried about it, except I get the impression it's a good idea to carry out the reaction outside, where it is cold right now. If working outside in the cold is a no-go, is there any etchant that is "safe" (I understand that safety is relative, I mean along the lines not immediately gassing me) to use indoors with ventilation? If so, how much ventilation is needed? Are we talking an open window, or an industrial fume extractor? Also, I wasn't sure which category and channel would be the best, so if a mod or somebody sees this and has a better classification, go ahead and change it. Sorry for making this such a long question; I'd just like to be able to use my circuit board before I die ;). Thanks, dedgerton

Question by dedgerton    |  last reply