Concerning Evap Tests…

[Puppetnonsense]

An evap test was performed today on Jasco brand Naphtha, using a small mirror.

Upon evaporation, the mirror was held up to a light and photographed at an angle, so that any residue would be readily apparent. The mirror was also reflecting a dark background, so as to give any residue sufficient contrast.

The result of the test was immediately apparent: The Jasco naphtha left considerable residue on the mirror. An image of the residue was posted online for feedback. The feedback was unanimous in that the residue was unacceptable. One person even noted that it was the dirtiest evap test they’d ever seen.

An evap test was then performed using that same Jasco Naphtha, but this time on the flat bottom of a pyrex dish.
The result: The Jasco Naphtha left an almost imperceptible ring of residue on the glass that could only be seen when viewed from the ‘perfect’ angle.

This seems to indicate that glass is entirely unsuitable for the evaporation test, and that it should be abandoned in favor of readily-available mirrors.

I feel like I’m overstepping with such a statement—given my lack of experience and the prolific use of glass in evap tests—
but since the need for cleanly evaporating naphtha is so ardently stressed, it feels like it could be a dangerous blind-spot.


What do you think?

If the residue isn’t as big a deal as I’ve interpreted it to be, please let me know.

Otherwise, maybe willing participants could run some mirror evap tests on naphtha that was previously vetted using glass?

 

[Crusty Flakes]

any pics of the tests?

im curious coz solvents here are a complete unknown...

 

[PedroSanchez]

did you perform the same cleaning ritual on both the mirror and the glass?
there is a proper cleaning method for the equipment you are performing the evap test on. i don't know it myself (hopefully one of the chemists will step in here), but simply cleaning with dish washing soap or something along those lines is not enough to be completely accurate. i would imagine a mirror to be generally dirtier than a glass dish, so maybe this was dirt that was left behind on the mirror?

pictures would be cool if you can share here too.

 

[Puppetnonsense]

I'm unable to get an image to attach to a post. Can someone point me in the right direction?

 

[Voidmatrix]

I'm unable to get an image to attach to a post. Can someone point me in the right direction?

If you click "edit" on the post you want to add pics to, there will be a box that says "attach files to the post" outside of the text box. Click the box and then post. You will be redirected to a page that will allow you to attach photos.

What immediately comes to mind are the questions: What did you clean them both with before applying the solvent to them, and what did you use clean whatever tool you used to put that solvent on the mirror/dish (e.g. pipette). If whatever you used to clean the dishes has a residue that can be left behind, then it could be that as the residue shown after the solvent evaporated. If your tool for putting it on the dish wasn't sufficiently clean, then whatever may have been in/on it could be left where the solvent was initially placed on the mirror/dish.

I'd suggest cleaning the mirror with the highest percentage alcohol you can get your hands on, and try again.

One love

 

[downwardsfromzero]

I'm unable to get an image to attach to a post. Can someone point me in the right direction?

There's also an 'attach' button at the top right of each of your posts.

 

[Gharman]

What is the difference between the glass of a mirror and (borosilicate) glass of a drinking glass or beaker?

And if the solvent barely leaves any residue on a pyrex dish would this indicate the solvent being clean enough or does solvent proven dirty on a mirror bind to the spirit molecule somehow?

 

[downwardsfromzero]

What is the difference between the glass of a mirror and (borosilicate) glass of a drinking glass or beaker?

And if the solvent barely leaves any residue on a pyrex dish would this indicate the solvent being clean enough or does solvent proven dirty on a mirror bind to the spirit molecule somehow?

Mirrors typically get cleaned less often and less thoroughly than a drinking glass or Pyrex dish. Thus, a mirror may bear an imperceptibly thin layer of greasy materail that has gethered there form the atmosphere. This can then go on to form a greasy ring when it is picked up and redeposited by the solvent being tested. The type of glass is of no practical consequence in this instance.

It's preferable to use clean evaporating solvent so you're not inhaling vaporised grease along with your DMT. Excessive pulmonary exposure to condensed hydrocarbons (such as in the inhalation of liquid parffins) is known to cause lung damage and pneumonia.

 

[Rush56]

Ive been using medicinal benzine, wundbenzin(40-60°c), tryed many different, which is supposed to be pharmacutical pure naptha and also petroleum ether 40-60.

There was nearly always some kind of ring left behind. I went so far i bought distillation apparatus on aliexpress and destilled 3 times these solvents at 60°c and yet that ring or sometimes something like transparent residue, even a bit oily could still be observed under right angle and light.

Based on all this experiments i suspect few things:
-evap surfaces were not 100% clean, even though i was cleaning them
-its kind of condensation that gets created upon evaporation
-could also be residue of cleaning agents?

I also talked with some chem shop and got some answer from a chemist saying it could be something like condensation created when evaporation was happening.

I stopped bothering about it, no difference in end product with 3x or without destilling these solvents.

For example there is stated 0.001% evap residue on petroleum ether(Maybe even 0.0001%, got to check). And that was before destilling it, ofcourse.