Recent content by ldanielrosa

Thank you all for persevering with me. "Gardening is irrelevant to the chemistry.", I felt that I should address the concerns of .Scott. Borek, copper is the major impurity _that I know of_, but by far not the only one. There are false and true stones, steel springs rings and hooks...

Thanks for taking interest. MSDS for Black Swan ZAP, and for Rooto drain openers show 93% sulfuric acid. Corrosion inhibitors are not specified, but product bottle mentions their presence. Very pale lavender color. I had to hold two different samples side by side to see it. I will...

I have some assorted silver scrap that I committed to refining/recycling. I decided I prefer to save money and avoid bureaucratic headache by making "poor man's nitric acid" with sulfuric acid drain opener and calcium nitrate. The first stage goes well enough. I use gravity filtration on the...

I'm trying to find the "ideal" cross-section for woven yarns. As seen in the first image, a circular monofilament (assuming inviolable cross-section but infinite flexibility) will have a limit of 2d thickness, and repeat period of 2d√3. This allows me to calculate how long the yarn path length...

I have not made sodium chlorate, but I have done potassium chlorate. Simple reason is feeding it. Sodium chlorate is too soluble with respect to sodium chloride. Separating the two will be a bit more tedious than I wanted to commit to. However potassium chlorate has very poor solubility and...

While reclaiming silver from scrap, I see that I will have plenty of copper nitrate as a waste stream. I've found some material on reclaiming this at . I see that this will convert it to copper sulfate as an intermediate step. I would like to divert some of this to dissolve tin from scrap...

Thank you oz93666 and Borek. I see that minimizing losses will not be trivial. Thank you Mayhem for your concern on the financial side, but I don't quite agree with your calculations. I am reasonable confident that it will be an order of magnitude less expensive for me to isolate my own...

I'm making poor man's nitric acid to refine silver from scrap. I would like to waste as little as possible. I've noticed that about half the acid is destroyed oxidizing the metals, and I'd like to reduce that if possible. One reference mentioned that I lose only one in four in a "dilute...

I use ethanol for cleaning glassware and resin 3D prints. The glassware is sometimes used for food. If possible, I'd prefer to only keep one grade of ethanol on hand. I've made sugar mash, but that is hardly the least expensive feedstock for ethanol. I had given some thought to using wheat...

"1.7 x 10-3 ohm-cm" Which at 0.0071mm diameter, comes to about 429kOhm/m for 1 fiber. However the yarns appear to be standardized as 3k (3000 fiber), 6k, 12k, 24k and 48k. So one 3k yarn would be about 143 Ohms/meter. The 3k yarn in the 33 carrier flat braider Should give me a ribbon about...

Thank you for getting back to me so quickly. I followed the link. I think the curve will have a different profile for non-metals. I noticed that the modulus portion appears linear, and what I managed to dig up for aramid and for carbon fiber has similar behavior up to the knee. "One will...

I have a textile braider that does 8 or 16 carriers in round configuration. I plan to have a 33 carrier flat braider as well. I currently have the wild idea of making a ribbon of carbon fiber and examining it's usability for livestock electric fence, or some other ludicrously overpowered...

"Make a retroreflector from three identical mirrors, each face a 45° right triangle. Join two by their short edges, use the third to set the angle between the first pair, but tilt it to half the required reflection angle." Thank you so much, Baluncore. This is what I'm looking for.

"I don't understand, is QCD = quantum chromodynamics ?" Quick, Cheap, Dirty Hokay, so what's in my head needs to hit the paper. I wanted to keep this close to the vest because it may be marketable, and will be extremely cheap to mass produce. I want something I can stick on any vertical...

"Maybe if you can tell us why you want the 4° angular return, we will be able to suggest ways to implement the deviation. There are alternative solutions. You may need an autocollimator to measure the offset if it is critical. Reference...