Mars Pigments: Part 1
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- Опубліковано 3 гру 2019
- This episode is the start of my exploration of synthetic Iron oxide pigments.
The Mars Pigments are very stable and versatile pigments that can range from yellow oxide in colour through to reds, browns, violet and black.
Hope you enjoy!
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This works better if you dissolve the vitriol first and then pre-oxidize it with hydrogen peroxide. It will precipitate directly into bright yellow from the get go and greatly reduce weird side products or gunk that won't lighten up later. Careful though, because vitriol and peroxide is "Fenton's reagent" and it's like a piranha solution that burns anything organic, nasty to get on you. You can also get even lighter yellows by adding some alum in too. I'm guessing 1) the pH matters, and 2) it forms some aluminum hydroxide that ligthens it up or makes the light play through the crystals differently later? I don't know, but alum is mentioned in several old texts about this for better yellows, and I can confirm it works.
I wish these videos were around when I was still at university; these would have been amazing to show my art history classmates. The idea of these being shown in a classroom thrills me. :D
i know right?
Lol that’s how I feel some mornings making my pourover coffee! I get impatient and I want my coffee!
Really looking forward to part 2 of this!
i know right!
😔keep waiting.
@@AssistantLeaflet still waiting!
Try to introduce oxygen into the solution while you are shaking it.I use a fish tank bubblepump.Introduce the sodium carbonate into the iron solution,but only to precipitate 3/4 of the iron, the solution must be slightly acidic.bubble and shake until pigment forms, the more bubbles the better and faster.
Did you pre-wash your calico? It looks like it still has the fabric sizing on it and that’s why it doesn’t break the surface tension easily.
Thank you for the video! Good luck to you friend! I hope in the future we will see a bright yellow iron oxide.
do you ever try making opaque gouache colors with chalk?
Very good
greetings!
I like your processing video.i want process video of black iron oxide please mention the link.
Thanks
2:42 It *is* rather fitting. The Mars pigments are responsible for the planet's red color, as most of the surface is covered in a layer of iron oxide dust.
It makes you wonder. Is the Red Planet actually mostly solid iron, at least several layers down? And since it is red, and high content of iron, surely at one time the planet contained ice and/or water. 🤔
@@sunnycharacter Well no, it's mostly silicate rocks like Earth. Most of the iron is in the core, but there's enough on the surface to tint it various shades of red-orange. There's plenty of water on Mars, but it's all frozen: either underground as permafrost, above-ground in the ice caps, or in the air as thin clouds of ice crystals.
@@CubicApocalypse128 oh wow, interesting! Thanks!
More sodium hydroxide to be added and also blow of air in the water solution of fe2so4 and naoh to precipitate to yellow ochre then drying process
I've seen synthetic Iron Oxide Yellow being made Industrial scale in giant basins. They do a few things differently. They start with scrap Iron for one thing, but I think they also add things which will make some kind of clay for the Iron to precipitate on. But, more on the point for your attempts, They aerate the entire pot for many days, *BEFORE* filtering off the water. And that is when the black sludge turns yellow. But you got a yellow anyway, or at least an orange.
early 20th century books mention adding alum in with the ferric sulfate, which would form aluminum hydroxide as well (same stuff as in your basic lake pigment), which sounds effectively like exactly what you're talking about with the clay etc. It does indeed make it more yellow, I tried it both ways. Btw you can also just instantly oxidize everything with hydrogen peroxide if you're impatient and doing small batches. Faster than either bubbling or leaving out on a board. Air is cheaper of course.
Can you share how much quantity of hydrogen per oxide added
Did you hear/see/know that there is an organization harvesting the iron oxide tailings from old mining sites and working with paint makers like Gamblin to make their reclaimed earth paints. I would love to see you try that out if possible. :)
Interesting!
12:20 This brown is very yellowish.
@The Alchemical Arts. Thnak another wonderful video. :) Do you use tap water or distlled please ?
For this I just use tap water as its not critical to have a pure process as the iron pigments are pretty stable
@@TheAlchemicalArts Great, yes I agree, just keep it simple , THANKS :)
Great videos, beatiful yellow color, I m get this color using ferric nitrate with sodium hidroxide but the precipited becomes brown dark with magnetic properties . Please can you explain how to oxidizing the precipitate ferrous hidroxide to ferric hidroxide? Do you use hydrogen peroxide? Its necesary to calcinate? Excuseme my english is not good. Thanks from Ecuador.
Thank you, I think the way to avoid the dark brown is to not use too much Sodium Hydroxide or too strong a solution and then you want to remove and wash the precipitate quickly and well. I dont think you need to oxidize the pigment. The colour is dependant of the hydroxide group so the more hydrated it is the more yellow it will be as you remove the hydroxide by calcining it will become more brown and red. i hope this helps.
Please guide me to dye my hair in dark red color
🙏🌹
Did you pre-soak the filter to encourage drainage?
I did not and that was my issue 😔
Do you have a skill share? You should. You're useful. Be a bigger river if knowledge? Great channel regardless.