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HCl.? Yes.? The point is to move water.? I have since fallen back to a shallow, small pan and I rock it.? ? Way less etchant and works as well.IMO, if you want technical superiority of result, in

Hello Dave, Friday, March 22, 2019 I have used the Chinese tips and they seem OK for hobby use, so as the pencil is just a tip sleeve connection, carrier and lead for the tips, they too SHOULD

Copper sulphate is sold as root-rot toilet unblocker and other copper compounds as fruit

What etchant do you pump with it? Do you completely submerge it? ? Craig

All aquarium water pumps are magnetically driven, as is the one I posted.? I have two.? Care to guess what I've used them for?Aeration without isolating it is not a good idea.? Or use it outside.A

I wonder if they stopped selling 35% because it is used to make explosives?Another disadvantage of 35% is that once opened, it doesn't stay 35% for long.Sent from my T-Mobile 4G LTE Device

Bingo!Caution; algebra required!?Sent from my T-Mobile 4G LTE Device

The advantage is not the final concentration in the enchant.? It is that you are adding 65% water vs. 97% water.? The concentration of H2O2 in the final solution is the same.Sent from my T-Mobile 4G

Copper sulphate is sold as root-rot toilet unblocker and other copper compounds as fruit

Peristaltic pumps will never be sufficient short of 1/2 inch tubing and relatively high rpm.Sent from my T-Mobile 4G LTE Device

I have used FeCl, ammonium persulphate as well as HCl, H2O2 and H2O.? IMO, FeC.? IMO, FeCl is the worst of the bunch.? Ammonium Persulphate is hydrophilic and turns into clumps or a solid rock.?

Pretty sure I posted a link.Sent from my T-Mobile 4G LTE Device

The purpose is to move water. A bubble source in one place can do that.? Dont overthink and overengineer.Seriously, swabbing or rocking the container does a pretty good job.Sent from my T-Mobile 4G

The smallest of diaphragm air pumps would be more than sufficient. You should use an air valve the straight through part going to the bubbler, the variable partT to room air.Sent from my T-Mobile 4G

OK...thanks...?? two issues... one being?? regenerated and reused many, many times. the other is copper chloride disposal. What are we really talking about here with copper chloride

Anyone using regenerated cupric chloride to etch with really should read through the article linked below even if you read it quickly and have no interest in getting that involved with maintaining the

On 24/03/19 10:56, Harvey White wrote: > On Sat, 23 Mar 2019 16:29:17 -0500, you wrote: > >> I hafe to add my experience with aerating etching solutions.? I had a tank using ammonium persulfate.? I

If you want to try ferric chloride you really should consider using citric acid with it - the so called "Edinburgh Etch" You can read about it

Flow rates of peristaltic pumps are usually quiet small. Although they can be designed to pump at higher rates - the peristaltic pumps used during heart bypass surgery pump at about 2.5 liters per

Received from designer_craig at 3/24/2019 02:49 AM UTC: 30 volume H2O2 is a bit under 9%. It's called "30 volume" because a pint of it can generate 30 pints of oxygen. Jim H