Homebrew PCBs

Thanks again Adam. 

The Rex Allers article suggests obtaining a hydrometer to monitor the
density of the etchant, which should start out at a density of 1.17
g/mL, and will increase as copper dissolves into the solution. He
suggests a hydrometer with an expanded scale of 1.15 to 1.25 g/mL.
According to my tentative understanding a range of 19 to 31 Baume
would  work here, does this seem right?

I note that American Science and Surplus has some Chinex lab glassware
(student grade) at low prices. The beaker and erlenmeyer flasks are
available in the sizes you suggest:

http://www.sciplus.com/category.cfm?subsection=4

Would any of their pipettes do the trick?

The Rex Allers article shows titration using the burette and beaker,
is the erlenmyer flask better in some way?

Grant

--- In Homebrew_PCBs@...m, adam Seychell
<adam_seychell@y...> wrote:
> No reason I can think of. picnic coolers are cheap, and have a good
lid. I built 
> my tanks because I needed those dimensions. I coudnl't find anything
off the 
> shelf that was narrow and deep enough, base = 45x250mm  high = 350 mm.
> Any of the food plastics are ok with strong acids.
> Now you only concern is getting hold of some lab equipment.
> 
> Here is lab order list.
> 
> 1 * 5 ml class B volumetric pipette
> 	(preferred to graduated pipette)
> 	(buy a second in case you break it)
> 1 * rubber bulb pipette sucker
> 1 * 125 ml dropper bottle for indicator (makes life easier)
> 1 * 50 ml glass burette, class B.
> 1 * 0-50°C (or 0-100°C) glass thermometer
> 1 * 250 ml erlenmeyer flask
> 1 * Bromophenol Blue indicator
>      (1 gram will last you ever and a day)
> 
> 
> You also have to make some kind of stand to hold the burette, I made
something 
> out of wood that was a *LOT* cheaper than buying a dedicated stand.
Fasten the 
> burette with rubber bands to a length of wood, and hold that by a
stand from a 
> heavy base using a diagonal pole. The area under the burette nozzle
needs to be 
> free to place the erlenmeyer flask.
> 
> The deionized water and sodium hydroxide is available from most
supermarkets. 
> You also need some ethanol to make up the bromophenol blue
indicator. Its 
> probably better to get the right indicator rather trying to use
turmeric power 
> because it will be easier to see the end point of the titration,
which makes the 
> job easier to carry out.