@@ShAd0wE1337 And now tell me sawdust has a grain structure. ;) At least none of both (the lignin etc. stuff) is translucent. But HIPS if injection molded is translucent, and at the same time expanded styropor is white. As long there is no colouring additive, but just virgin plastic is used. Well some different additives are also in both forms I think.
Ah thin film interference. One of my favorite things. I've actually plotted out the colors you should get in Kaleidagraph, based on the wave theory. For normal triphosphor fluorescent light, you get a very distinctive color pattern that can be seen at 3:53. This order of colors is specific to the light source and would look different if you used an LED light or an incandescent light instead. The first few colors tend to stay the same though, as long as it's normal white light.
I really do love titanium and how "unique" it is (from the process used to make it, how "strong" it is, how it's more complex to form, how heat resistant it is etc.). To me it's the most fascinating thing in metallurgy when you first discover it. Also Action Lab, I know that we all have a right to make money off our services and I understand that ad revenue is a good source of it, so I just wanted to say that I'm glad you openly disclosed your sponsor at the end of the video. It's my favourite way content creators advertise for other companies' products and I hope to see more of it presented this way.
When you look at metal shavings from a CNC mill, you can see that it takes on a very strong pinkish/purple color due to the strong heat generated when shaving the pieces off. My instructor at work used to collect the metal shavings from the lathes and mills down in the shop to explain heat treatments to us.
I wear a titanium ring that has a groove around it with the blue colour at the bottom. The great thing is the stability of the colour. I like the ring because it reminds me of the grooves for the rings on a piston. Plus, when you drop it on someone's palm they are amazed at how light it is.
My friend brought a titanium bolt to school from some new ford back in 2015. Almost everyone bet it was aluminum. He made like 60 bucks that day lol He proved it was titanium with a file
You didn't mention it, but microcenter carries other fun things like 3D printers, drones, Raspberry Pi (and tons of accessories) simple robot kits, electronics and much more - they do have a lot of tech in the store. One of my favorite stores!
Titanium is great for piercings, and being able to anodise it to make pretty colours means it’s more appealing to people too! It’s also great for jewellery if you don’t want piercings :)
Awesome experiment! I'm always learning a ton from you and I appreciate it. Years ago I acquired some pure Niobium and a Ferro-Niobium alloy which I did many color change experiments on. As I remember there may be like 5 different oxides that can form which affects the color it appears. Also I think it could be achieved using chemical, heat, or electrical means...but it's been a long time.
Small correction: At 3:38 you say that the titanium disc looks blue because it is absorbing red and green light. This is not true, and contradicts the explanation you gave earlier. It appears blue because the red and green light from the surface and the oxide layer are destructively interfering with themselves. This is not absorption. When something appears a certain color to us, that means the only light leaving the object and hitting our eyes is that color, but that does not mean all other colors of light were absorbed. Absorption is just one of the mechanisms by which this can happen.
Confusingly, it actually *is* absorption, even though the destructive interference explanation is correct. Energy is conserved in this interaction. When the waves destructively interfere, the photons still have to go *somewhere*. The waves cancelling outside of the titanium oxide boundary layer means that there is zero chance of detecting the photon outside of that layer. Which means it was absorbed by the layer. At the end of the day, the wave-only description is just an approximation of the actual quantum mechanical phenomenon, which says that photons are also particles and they can't just disappear.
I love this channel, and have tried some of your experiments in the past. For fun I sometimes play your videos at a slower speed to sound like a weird acid trip. Try it :)
Changing playback speed to 0.25x maximizes the LSD effect, and I am in diaphragmatic pain with the resultant laughter 😃! It's so cool that DSP can time shift the audio while preventing pitch shift. First encountered this playing with a Korg digital audio effects processor; blew my mind 😳
@@stephanrosos4957 the descripted words used that makes it all work. I'm glad you found it funny because I thought it was just me. Thank you for the reply. 😉
i wondered years ago if there's colours that we don't know or we can't see because we don't have those things that make us see specific colours like red green and blue, and how would we notice if the colours are there but just that we are blind to those colours like dogs are colourblind to some colours (I can't recall which) i heard that a species of animal (i also can't recall which, maybe it's flies or maybe not) can see ultraviolet light (?) or some other frequencies
Bismuth is another really cool metal. It's colors change depending of the oxidation state of the surface of the metal. Also liquid bismuth makes cool crystals when it hardens and crystalizes.
Great! Now I just need confirmation that this method can be reliably used to turn copper green. So far I managed to turn it blue by dipping it in vinegar+salt.
How would anodized Titanium react if it was in a different light surrounding it, for instance UV, IR or any other form of Light that isn´t white light. Would it show different colors?
If its a monochromatic light then the titanium coin will look either dark or bright for destructive and constructive interferences respectively depending on the thickness of the oxide layer. If its UV or IR, the same thing will happen but we humans won't see it.
Just wanted to say thank you for still doing the longer form videos. I don't understand the push for channels like this to make more sub-minute shorts. I can see how it might be better for more mundane subject, but explaining technical and scientific phenomena isn't terribly conducive to Short Attention Span theater in the first place. Keep up the good work!
"rainbow metal" has been my favorite thing since I was a teen. I want to get an anodizer to make my own jewelry and accessories. There's not enough of this!! Personally I'm baffled that colorful metals aren't the NORM.
Different grades of carbon steel and other alloys can make some cool colors as well when anodized with different acidic or metal salt solutions… I used to have a blacksmithing business.
Man, you're killing this channel by uploading the same thing on to your shorts channel. Great video but I dont feel like watching these videos because I know I will be able to watch a summarised version in a few days. I've been subbed since you had like 100k subs. I still remember your old logo. Hope you reach 4mil soon!
I like cars and a lot of aftermarket exhausts have this coloration, mostly because the car spits flames. Paganis have this coloration on the exhaust tip.
Stainless steel can have beautiful colors but a shielding gas is required as well as welding. Titanium will do the same but with welding titanium you look for a gold or wheat color while welding
Interesting, I've always thought that the titanium dioxide layer was refracting light in some way, but it's actually wave interference. Nice! Maybe I'll get a chance to try this myself
Thin film interference would predict a rainbow pattern reflection, with all colors showing at some definite angle, but the oxide surface clearly shows just one color. Any simple explanation for the supression of the other colors?
@@karunamundra592 To answer your question, the titanium will oxidize first, preventing any reaction with the chloride ions. At high enough voltage it may be possible to drive the production of TiCl4 by reacting TiO2 and Cl2, but it would take some ugly thermodynamics calculations to be sure.
Does voltage really have anything to do with the color? I thought it's the oxide film thickness that's the key, which means you can hold the sample in for longer to get the other colors.
once you build up the thickness at a certain voltage, increasing the length of time doesn't do anything. The voltage controls the thickness as DANG JOS said.
@@TheActionLab Why is that, though? I definitely know that when coating stuff with copper, the factors affecting the thickness of the deposition layer are current and time.
@@dryued6874 TiO2 is an insulator, as long as current flows the oxide layer grows, but the resistance also grows, the higher the voltage the thicker the insulator needs to be to stop current from flowing this is just an educated guess, so take it with a pinch of salt.
Hi. There's something I didn't grasp well: if the colour is due to thin film interference, shouldn't it vary according to the angle of observation? Instead, the colour appears the same regardless the point of view. Alberto Rasà
I'm considering doing this to a titanium dive knife... would the oxide layer negatively effect the knife in any way e.g. salt water corrosion/hardness etc? I'm guessing that it shouldn't and any effect that it had would be surface only?
Shouldn't change it's corrosion resistance, at least on the inside. The oxides are pretty scratch resistant on titanium though, and the process can be repeated if the finish becomes too scuffed from use.
It shouldn't have much effect. The titanium oxide layer is very thin at few hundread nanometers. its very stable in salt water. I also don't think it will affect the cutting properties. Haven't done this myself but I have a degree in materials science.
The mouth piece on my Trombone is made of titanium and it has turned purple on the inside after a while of use. Is it really getting that hot in there?
Sir my physics always gets up to mark and i have a nice experimental knowledge in my whole school.. It is cause i watch your videos and try them if possible... Thank you for this and teaching physics as Sir Walter Lewin taught.... Love your videos sir...
