Do you guys have any tricks for accurately weighing dry powder?

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I have a milligram scientific scale and it’s becoming apparent that it’s obviously not accurate when pouring small amounts (15-20mg) of powder into the tray. I’d rather not store everything in solution, so do you guys have any tricks to get accurate measurements with this?

Put the calibration weight on the scale (it should be 10g with most scales) and then weigh whatever on top that. The scales tend to be more accurate with a little bit of weight on them vs with something that barely registers.

Also calibrate it, make sure the batteries are fresh, don’t knock the scale around a lot so you don’t damage it.

Most importantly don’t trust a shitty amazon scale with substances that are active in sub milligram doses, unless you put enough weight on it to average out the error of margin.

Here’s the method I use for weighing out powder with my Gemini-20:

Go through the scale’s calibration process (see manual).

Allow scale to zero.

Add tray and a piece of weigh paper. This will total to approx 3 grams.

Calculate target weight based on desired dose (e.g. 2.991 + 20mg = 3.011)

Add powder until you hit target.

Using this method and a set of calibration weights I confirmed my scale is usually accurate to within 1mg.

Edit: Also if you add only very small amounts of powder at a time and the scale does not register it, you can touch the paper lightly with your scoop and then allow it to settle back to an accurate weight.

This seems strange to me. I understand the mechanics behind using a heavier weight to make it more accurate, this makes total sense to me and I always do this anyway. But I always assumed that when you tare, the scale just mathematical subtracts the weight on the scales to make it 0. It shouldn’t effect the sensitivity. But you’re saying it does? Can anyone explain how this resets the sensitivity of the scales back to being less accurate?

There’s two important factors when using cheap milligram scales: threshold and incremental addition. The top comment provided a solution the threshold problem already with the card tip.

Avoid the incremental problems by introducing the full weight of the dose or store immediately and together. If you add a chemical to a cheap scale 1mg at a time, you can accumulatively reach dozens of milligrams with the scale continuing to read 0mg. Meanwhile you can introduce 8mg to that same scale immediately and produce a 8mg reading repeatedly.

This means having to tare and weigh repeatedly to refine the weight but it’s worth the improved accuracy.

Anyltical balance. Within .00000 accuracy every time! Only like Jesus fuck I don’t even want to actually know. I work with small powders on occasion so I have access to one. It would be wonderful if everyone had access to all the tools, materials, and equipment they might need to mitigate harm!

I use vegi-caps with the tray. Calibrate the scale. Weigh half a capsule by itself in the tray. Put my small amount of powder (10-20mg) in that half capsule and weigh. Be sure to write down how much the tray and capsule weigh, before adding the powder and do simple math.

I stack these in this order, and then tare:

Square of magazine paper lightly creased down the middle.

Tray

Tiny loop of tape to stick tray to weight

10Mg weight .

Scale

Then I stick a bunch of half capsules in a wad of silly putty and fill them, close them with the other half capsule, reweigh them knowing the weight of an empty capsule, and mark them with a thin sharpie if they are not my usual powder/capsule color combination.

Storing etizolam in solution is completely fine when using ethanol or pg, it’s very stable

Try volumetric dosing. Essentially, you take a known large amount of the powder and dissolve it in some given amount of liquid, which can be water, an alcoholic beverage, or even oil, depending on the solubility of your chemical. Then, you can take a fraction of the liquid, knowing that it will contain the same fraction of the original powder. It has some drawbacks, like you can’t snort or smoke it without evaporating the liquid, or that it isn’t usually safe to store the liquid, so you have to either use it quickly or hide it well. However, it’s the only real way to weigh very small amounts of substances without expensive equipment. Also, remember to shake the liquid before taking any of it, so any undissolved powder spreads homogeneously.

A lot of cheapo milligram scales are only accurate to within +/- .005 (at least mine is) so depending on the substance you want to keep that in mind.

Also fresh batteries are a must! As soon as the batteries start to lose their charge it can drastically effect the reading. Keep a fresh set handy and calibrate often!

Gonna assume you got a gemini 20 likes everyone else? I just always recalibrate before I weigh anything at all. I use the little tray it comes with too, because it’s more accurate with some weight already on it. I tare it, haven’t had issues as long as the tray is there.

I had an older gemini 20 that, idk if I spilled something on it or it just became a piece of shit, but it stopped reading right. I tossed it and paid 20 bucks for a new one. 20 bucks is worth your life imo

Analytical scales with mg reproducibility are not cheap. And they come with a wind protection box, and need to be periodically calibrated.

If you don’t want to store in solution, use volumetric dilution with an inert powder (e.g. lactose). This requires thorough mixing, e.g. using an agate or glass mortar/pestle. Start by adding portions, homogenize each time.

The same principle as volumetric dilution applies, only for gravimetry, not volume.

you are introducing the possibility of hot spots by mixing it with an inert powder.

What are you going to do with your powder after mixed? Eyeball it? You missed the whole point of volumetric dosing which was to avoid the use of a scale while still being able to get reliable doses easily.

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