Tannic Acid Puns

Ex-JW here. I have a friend that just woke up.......lots of Mormons around her. She seems enamoured. They made her pour out her tea?

I know virtually nothing about chemistry and I'm trying to make ink during quarantine! The other day I was successful in producing a very usable black-ish ink just by boiling some crushed acorns and adding to that liquid some rice vinegar that I had simmering in a bit of steel wool. The brown acorn liquid turned black after a minute or so and I was delighted.

I'm trying to repeat the process with better materials, so I'm wondering what kind of reaction is actually happening and whether I can replace what I've got with other household materials. If tannic acid is all that's needed, could I get a better result using tea or coffee rather than crushed acorn liquid? And If I want to make a better iron sulphate, could I try fractionally freezing some white vinegar to make a stronger acetic acid and then boiling that or something in the steel wool? I have no idea what actually makes the ink but I'm super interested! And I know that I would be playing with acid and stuff so safety is on my mind too

Hello all you lovely lab-dwelling redditors! Got another silly question for y'all:

I'm a metalsmith and most of my life is coated in a fine layer of steel/iron dust. Right now we're using walnut for a client project and even though all the work is happening outside the dedicated metal area, the walnut is turning black too quickly (as are our hands). Any safe-ish way to stymie the reaction? I'd rather not seal the wood until all the carving is done. I'm thinking a mild caustic wash or something. Bonus points if it will also work on veg-tanned leather.

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https://preview.redd.it/kfem5u3qg8j21.png?width=400&format=png&auto=webp&s=f8b45139b7bfccd4bbd1b9fae375d3d94ee5347a

Hello all, I am trying to complete my own project where one of the steps involves hydrolysis of tannic acid.

I have purchased some pure tannic acid to investigate this step as I am having issues and want to remove all other variables.

Tanning acid has this structure: http://upload.wikimedia.org/wikipedia/commons/thumb/6/65/Tannic_acid.svg/800px-Tannic_acid.svg.png

I trying to obtain Gallic acid: http://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Gallic_acid.svg/800px-Gallic_acid.svg.png

This seems fairly trivial. So I took about 5g of tannic acid and refluxed with 20ml of 0.5M sulfuric acid for 1 hour.

I expected on cooling for the sugar molecule to remain in solution and the Gallic acid to precipitate out as crystals.

So during the process the solution darkened significantly and then on cooling, one trial precipitated a fine brown powder and the other did nothing, everything has remained in solution.

Any ideas about what might be going on?

Tanning solutions work on dead animal skins, so I imagine that prolonged, repeated exposure would have some effect on living animal skin (a person's). Additionally, I read that different tree species' barks were used to tan hides into different colors (i.e: chestnut oak vs white oak, resulting in brown vs yellowish hides respectively). So is my hypothesis correct? Did historical writings on tanners ever mention that their hands were discolored from the hide tanning process?

is this possible? i know the tannic acid in driftwood can naturally lower pH, so could an aquarist go so far as to just buy tannic acid (mostly available as a powder) and put that in the tank? just a thought. it would seem to be a safe alternative from the nasty chemicals they sell nowadays.

First attempt, please be nice.

Reol sat quietly, his tendrils coiling in agitation as he examined the mass spectrometry readout of the little leaf in front of him. It was crammed full of compounds, some mundane like glucose and cellulose, found on many habitable carbon-rich planets, some more exotic, like chlorophyll. That was not what attracted his attention.

"Merciful stars. What is this hellish monstrosity?" he whispered, staring in horror at a separated readout of toxins. Neurotoxins crammed this leaf to the brim. Reol had suspected as much, given that one of the unfortunate interns had to be hospitalized after touching the leaf without proper precautions, but even now, knowing it was sealed in an airtight tube and that those poisons couldn't reach him, Reol still felt as if he could smell the fumes. He remembered the agonized look on his intern's face as the boy went down, convulsing violently. "No wonder Caish collapsed." By his count... there had to be at least eight known neurotoxins in that plant. Reol's tendrils trembled slightly as he floated up from his seat, his buoyancy sac inflating slightly to reduce his density. He glided to the plant and settled the report in its proper place behind the tube.

With a sigh of relief, Reol turned his attention to the next sealed tube, this one containing a thin slice of some sort of very juicy root. He pulled the spec report and froze, his three heart-sacs beating even faster than before. With a violent thrash his tendrils launched him away from the root and partway across the room; his buoyancy sac had inflated in alarm and now bumped into the ceiling.

"What's the big issue, Reol?" Skellor, his fellow botanical chemist, asked, tipping slightly into the room, his thermal sensors widening slightly. A slitted eye blinked in confusion at Reol's obvious panic. "You're bright red. What happened?"

"I... here. Have a look. This is that root we were looking at."

Skellor took the readout and made an incredulous bubble of noise. "What... is this thing?"

"It's a root we found. The human said..." Reol shivered. "The human said it liked this one."

"My God." Skellor stared at the tox report in horror. "Is this some kind of horrific drug?"

"N-no. The human– sorry, Mr. Je... Jessin? Jonsen?"

"Johnson."

"Right, Mr. Johnson said he just liked it. To eat."

"You're joking, right?" Skellor's tendrils started to coil and uncoil while bright red spots flickered over his main body.

"No.

Thanks. If not, which German beers sold in the USA are all three?

Im going to be honest, I know nothing about wine as I am more of a beer drinker.

I have a dinner party tonight and my brother who's a butcher has brought me some A grade rib eye to bring to the party. So I was looking for some advice on type of wine to pair with rib eye fillet; I believe we were going to have with a salad. I live in Australia if that's a factor in anything.

Thanks in advanced peeps

Edit: went with the cab sav and it was great. Appreciate the advice from everyone. Thanks

I love coffee. But its always caused me severe GI distress. I have wondered what it was about coffee that did this to me, as caffeine didn't seem to do the same thing to me (I can take caff pills all day long, no trouble). I don't think its the pH itself that does it to me, as I can drink a bunch of lemon juice with no trouble it seems, as well as other acidic things. Then I noticed red wine gives me the same reaction, but not white wine. Tannic acid perhaps? Chlorogenic acids?

Regardless, I hadn't had any coffee in like 2 years and I missed it dearly. I wondered if it were the tannic acids, if the effect could be blunted by neutralizing the coffee. I had some litmus paper laying around and tested my coffee. pH 5.8. With sodium bicarb I titrated to pH 7. Drank a cup. No issues. Drank a second. nothing. I'm 4 cups deep atm, no trouble. I'm using as little bicarb as possible to neutralize. Flavor is perfectly fine to me.

Anyone else fiddled with anything like this? I know I'm a heathen for fiddling with my coffee, lol. But if this simple modification lets me drink it, I'm in.

Growing up I was taught the reason Mormons don't drink tea (the real kind not herbal) was because it turned your insides into leather. Anyone else taught this ridiculous nonsense?

I need some rust converter (phosphoric acid) to prep some outside metal before priming it.

All the stores that I have looked at: Home Depot, Lowes, PartSource (Merivale - automotive), Canadian Tire, have tiny bottles or spray cans(!) and the contents are often not just phosphoric acid, but also include tannic acid, etc. and are quite expensive ($10+ for 276 ml)

I am looking for a source in Merivale Road area to Centretown but can travel further if necessary.

Also, for those of you who used phosphoric acid on rusty steel, how do I determine that I have not left a residue on which would interfere with primer adhesion? If the surface has not converted, what should it look like before I prime? I know that the converted rust will turn to iron phosphate

I have already rigorously sanded and brushed the loose rust off.

For context, Uriel and Pasanius have both entered the Library of Ptolemy to meet with Varro Tigurius for a final test to see whether they are fit to rejoin the Chapter. Upon entering the Arcanium - the very heart of the library - they see what is probably the Ultramarines’ Holy of Holies: the Codex Astartes penned by Roboute Guilliman himself.

> A heavy table of dark wood filled the centre of the chamber. Upon this table were four enormous tomes, their spines a metre long and thick enough to enclose a book a third of a metre deep. Each book was secured to the table by a heavy chain of cold iron through the faded gold leaf edging of their leather bindings, and the pages were off- white vellum that had yellowed with the passage of millennia. Tightly wound script filled each page, each letter precisely formed and arranged in perfectly even lines of text.

> Uriel took a deep breath at the sight of these books, letting the myriad aromas settle in the back of his throat and transport his mind back to the age of their creation. He tasted the tannic acid, ferrous sulphate and gum arabic of the ink, the warmth of the hide used in the vellum and the chalk used to prepare the surface to accept the ink. But most of all, his senses conjured the image of the singular individual that had penned these mighty tomes, a god amongst men, and a figure to whom uncounted billions owed their lives.

> These works of genius had lived in Uriel's dreams for decades during his training, but until now, he had only been allowed within the presence of copies.

> 'Is that what I think it is?' began Pasanius.

> 'I think so,' said Uriel, stepping towards the books with an outstretched hand.

> Both men stared at the enormous books, too lost in their reverence for the instructional words that had guided the Ultramarines for ten thousand years to notice that the door behind them had shut and another had opened.

> 'I wouldn't touch that if I were you,' said a resonant voice. 'It would be a shame if the Arcanium's defences killed you before I could pass my recommendation to the Chapter Master.'

> Uriel snatched his hand away from the book, and looked up into the hooded eyes of the Chief Librarian of the Ultramarines, who stood on the other side of the table, though neither he nor Pasanius had been aware of his arrival.

Tigurius explains how Guilliman had originally begun to write the Codex when he was a boy, and this segues into a discussion of what the Codex mean

Has anyone ever used honey locust for a cutting board/charcuterie board? This stuff is rock hard, but just wondering if there is anything I should know about the wood before I get going on it

It may not come as a surprise to most people that coffee can have a positive effect on mood. Many of us rely on this benefit before hitting the road in the morning and throughout the day at work.

But coffee may have other mood benefits that simply elevating mood shortly after its intake. Numerous smaller studies have indicated that coffee can help prevent mild to moderate depression—a disorder that affects 15 percent of people in high-income nations.

More recently researchers at Qingdao University Medical College in China have carried out a meta-analysis of the results of 15 of the previously conducted studies looking at the correlation between coffee consumption and depression.

The results of the meta-analysis, which was published in the March 2016 issue of the Australian and New Zealand Journal of Psychiatry , suggest that there is an eight percent reduced risk of developing depression per average cup of caffeinated coffee consumed per day.

We don't yet know how coffee help alleviate depressive disorder. But the researchers suggests two potential mechanisms.

Although depression is often taken to be a result of low serotonin-levels in the brain, a new hypothesis is emerging. According to this hypothesis, depression is a result of a bad immune reaction that causes an inflammation to the brain .

The Chinese researchers speculate that coffee may help alleviate this kind of inflammation, owing to its special combination of anxioxidants—which include chemicals such as chlorogenic acid, nicotinic acid, trigonelline, quinolinic acid, tannic acid, pyrogallic acid.

Another hypothesis is that the anti-depressive effects of caffeinated coffee consumption is a direct result of the caffeine. Caffeine is a psychostimulant that can increase wakefulness and motivation.

When we are awake and alert after a good night's sleep, there is very little adenosine in the central nervous system. During several hours without sleep, however, adenosine slowly accumulates. Adenosine activates adenosine receptors, which causes drowsiness and a lack of motivation and energy.

Like adenosine, caffeine binds to adenosine receptors in the central nervous system but unlike adenosine, caffeine does not activate the receptors. Instead, it blocks them, which prevents them from causing the normal cellular response that leads to a lack of energy and motivation.

This response explains why coffee consumption can help us stay awake and alert in the short run. However, it does not by its