mixing my own developer supplies

[aaronnate]

I know this is probably real easy and I'm probably over thinking but it has been about 25 years since I mixed up a developer from scratch. I only did it once, it was in a college chemistry lab, under a hood, weighing with a triple beam balance, using a magnetic stirrer.

I've ordered the chemicals for Pyrocat-HD but realized I have no lab ware. Can someone recommend the dishes and lab supplies I will need?

Is a regular digital food scale (dedicated to this obviously) acceptable?

[jp]

You can get little drug dealing scales on ebay/amazon that measure the small amount of grams for most of this stuff quite inexpensively.

The powdered pyrocatechin is bad stuff to have loose in powder form, so dispense and dissolve that outside.

[aaronnate]

You can get little drug dealing scales on ebay/amazon that measure the small amount of grams for most of this stuff quite inexpensively.

The powdered pyrocatechin is bad stuff to have loose in powder form, so dispense and dissolve that outside.

Are those scales called pocket scales?

[Bob Salomon]

Are those scales called pocket scales?

Oahus

[jp]

Are those scales called pocket scales?

Yes

[Steven Ruttenberg]

I prefer tripple beam balance, no batteries, easily calibrated, works for forever and as accurate if not more so than any digital scale in the same class of weights being measured.

[Pere Casals]

Is a regular digital food scale (dedicated to this obviously) acceptable?

Yes, but even the best Lab scale requires Calibration Weights, some $6, Amazon, to know if it works ok.



You also would need an additional precision jewelry type Scale, with 0.01gr or better 0.001gr precision, say a $10 one, some include and small calibration weights set, if not you will also need one. That scale would be of 100 to 500 max load.




You may need that small scale for some ingredients, for example to mix 1 Liter of Mytol, (Xtol substitute) you need to measure 0.15gr of phenidone, you would not be able to do it with a food scale.

Best way is having two scales, a food type one for say 40gr and up, and a jewelry one for under that. And, I reiterate, it's important having calibration weights.

[koraks]

You can make a 5% phenidone stock solution in 96% ethanol. Easier to weigh and measure and lasts quite long.

[Pere Casals]

Yes, but then you need 50grs of phenidone, worth to make 333L of Mytol (50/0.15), adding cost of Ethanol this is 3x the cost of the jewelry scale, with a single ingredient.

Belive me, the small scale is a must... any ingredient under 10gr may have a 10% error with a food scale, or 20% if it has 2gr steps, ...and having to dilute many ingredients, this is a mess...

I use mine for DIY emulsions, to me it would not be practical the food scale, which I use when weight is larger.

[Two23]

I'm on my state's grand jury. I'll mention that if you keep one of these scales in your car and it has white powder residue on it, any cop stopping you for a traffic violation is going to go nuts when he sees that scale.


Kent in SD