Open a box of small titanium screws from a medical hardware supplier, and you will see something unusual: some screws are golden, some are blue, some look purple or teal. No one painted them. The color is part of the metal surface itself. That is titanium anodizing, and the titanium anodizing colors it produces do not fade, chip, or wash off.
Titanium anodizing colors come from a thin oxide layer grown on the part's surface, and the color you see depends entirely on how thick that layer is. Thick film, thin film. Different thicknesses, different colors, from bronze and blue to magenta and green. The process also improves corrosion resistance, wear behavior, and biocompatibility, which is why titanium anodizing colors show up in medical implants, bicycles, firearms, and luxury consumer goods.
This guide explains what anodized titanium looks like, where the titanium anodizing colors come from, how the Type III process works, why colors sometimes come out uneven, and what to ask when you need colored titanium parts.
Anodized titanium is titanium whose surface has been converted into titanium oxide by an electrochemical reaction. The anodized titanium part sits in an electrolyte bath as the anode, a voltage is applied, and oxygen from the electrolyte builds a controlled oxide film on the surface. That film is what changes the color.
Not all titanium anodizing is about color. There are three process types:
Type I: a high-temperature electrolytic oxidation process, specialized and rarely used for general parts.
Type II: produces a dull gray surface. Its job is functional: better wear resistance, lower friction, and corrosion protection. Part dimensions stay unchanged.
Type III: produces the vivid colors. This is the process behind bronze, blue, magenta, and green anodized titanium.
When people talk about titanium anodizing colors, they almost always mean Type III.
Type III titanium anodizing gives a single, stable color across the whole surface. If you have seen colored titanium parts on a bicycle, a watch, or a medical instrument, chances are they were Type III anodized titanium. The available range covers:
Color | Film Thickness | Typical Voltage Range |
|---|---|---|
Bronze / gold | Thin | Low, around 12 V |
Blue | Medium | Medium |
Yellow | Medium | Medium |
Magenta / pink / purple | Medium-thick | Higher |
Cyan / teal | Thick | High |
Green | Thickest | Highest, up to around 100 V |
The exact voltage for each color depends on the electrolyte, the bath temperature, and the part itself, so treat the numbers above as a starting point rather than a recipe. The key relationship is simple: more voltage grows a thicker oxide film, and a thicker film produces a different color. The whole titanium anodizing color range runs from about 12 V for bronze up to about 100 V for green.
The color is not a dye. It is not paint. It is interference.
When white light hits an anodized titanium part, some light reflects off the oxide film on top, and some passes through the film and reflects off the titanium underneath. The two reflected light waves arrive slightly out of step because they traveled different distances through the oxide layer. Depending on the thickness of that layer, some wavelengths cancel each other out and others build up. Your eye sees the wavelengths that survive, which is one specific color.
Thicker film means a longer light path, which means a different surviving color. That is why controlling the oxide film thickness controls the color, and that is why voltage is the master knob. Higher voltage drives the reaction harder, grows a thicker film, and moves the titanium anodizing color along from bronze toward green. Hold the voltage steady, and the film thickness holds steady, and the titanium anodizing colors hold steady from part to part.
If you only need the comparison:
Type II Anodizing | Type III Anodizing | |
|---|---|---|
Appearance | Dull gray | Bright, full color range |
Purpose | Wear resistance, low friction, corrosion protection | Color plus surface protection |
Color options | None. Always gray. | Bronze, blue, yellow, magenta, cyan, green |
Part dimensions | Unchanged | Unchanged |
Best for | Functional internal parts | Visible and cosmetic parts |
Type II is the workhorse finish for titanium parts that slide against other materials. Type III is the titanium anodizing color process you use when the part is visible and the color is part of the design.
A consistent titanium anodizing color does not happen by dipping a part in a tank and pulling the trigger. The sequence matters:
Clean the part in an alkaline solution to remove oil, fingerprints, and handling residue.
Rinse, and watch the water. It should sheet off the titanium, not bead up. Beading means oil is still there.
Hot rinse so the water evaporates before the next step.
Acid-clean the surface to strip away the thin oxide film that naturally forms when titanium sits in air. Exposed base metal is the best starting point for an even color.
Cold rinse, then neutralize any remaining acid, then rinse again.
Anodize. Submerge the part as the anode in an electrolyte such as sulfuric acid or trisodium phosphate, and apply the voltage that gives the film thickness, and the titanium anodizing color, you want.
Rinse off the electrolyte, then finish with a final hot rinse that evaporates to leave a dry, colored part.
The chemistry is simple on paper. The execution is where good shops separate themselves from average ones.
Splotchy color on an anodized titanium part almost always comes back to the surface, not the tank. Two causes account for most bad results:
Rough or uneven surface. Machining marks, work-hardened areas, and smeared metal carry current differently across the part. The film grows unevenly, and the color comes out uneven. Polishing or smoothing the part before anodizing is often the cheapest way to fix this.
Delayed or dirty preparation. After the acid clean, the fresh titanium starts re-forming its own oxide film within hours, just from sitting in air. Even a fingerprint left on the prepared surface becomes a visible patch later on. The anodizing should happen immediately after preparation, with clean gloves and clean racks.
If a color comes out wrong or splotchy, the recovery is straightforward: strip the oxide layer off, usually with a strong acid, or sand it off by hand, and run the process again on a fresh surface. Surface preparation is the single biggest factor in clean, repeatable titanium anodizing colors.
A few questions come up on almost every colored titanium project:
Does the color fade? No. It is a permanent chemical film, not a coating. It will not wear off from light exposure. It can be lost mechanically by scratching, or chemically by strong acids and alkalis, but normal use does not fade it.
Is it shiny? Type III anodized titanium has a bright, reflective surface. Type II is dull gray.
Is it more expensive than anodized aluminum? Yes. Titanium raw material costs more than aluminum, and the anodizing process is more specialized. Budget for both.
Can a bad color be fixed? Yes. Strip the oxide and start over. That is one advantage titanium anodizing has over paint.
Does the 720 rule apply? No. That rule is for aluminum anodizing, where film thickness depends on time. With titanium, the film thickness is set by voltage, not by how long the part sits in the bath.
Can any titanium alloy be colored? Most titanium alloys anodize, but the exact shade varies by alloy. Grade 5 (Ti-6Al-4V) anodizes well and is the most common titanium alloy for machined parts.
The practical takeaway is this: the titanium anodizing color you see in the sample is the color you get, but only if the surface prep is right and the process is controlled. Before you commit to colored titanium parts, ask your supplier about three things: how they prepare the surface before anodizing, how soon after preparation they run the bath, and whether they can send you a small sample in the exact alloy and finish you plan to use.
At Minghao, we machine and anodize titanium parts in-house, and we know where the uneven colors hide. We will walk you through the alloy, the finish, and the titanium anodizing color range before production starts, and we will send a sample first. Send us your drawing or your photos, and tell us where the part will be visible.
The information provided in this article is for general reference only. Voltage ranges, color outcomes, and process details vary by electrolyte, equipment, and titanium alloy. Always verify specifications with your finisher and consult qualified engineers before making production or procurement decisions. Minghao shall not be held liable for any loss or damage resulting from the use of the information contained in this article.
