Starphire is a low-iron glass made by Vitro Architectural Glass, formerly PPG Glass. Standard clear glass carries enough iron to give it a green tint, strongest on the edge. Starphire has far less, so the edge reads pale blue-white and the tile behind it shows its real color. If you’ve seen it written as “Starfire,” that’s usually the same glass. There is one exception, covered below.
Most people picking glass for a new shower never see the difference between standard clear and low-iron until both are sitting in the same room. Then it’s obvious. Whether it matters for your project depends on how big the panels are, how the bathroom is lit, and how much the glass is meant to be a design feature versus a function. Below is what eighteen years of installing both has taught me about when the upgrade is worth it and when it isn’t.
Starphire vs. standard clear glass at a glance
| Standard clear | Starphire (low-iron) | |
|---|---|---|
| What it is | Ordinary float glass, tempered for showers | Low-iron float glass from Vitro, tempered the same way |
| Color through the glass | Slight green cast, stronger on thick panels | Neutral. Vitro rates it 87% less green than clear |
| Edge color | Green | Pale blue-white |
| Light through a 1/2” panel | Lower | 90%, about 7% more than clear |
| Strength and scratch resistance | Standard | Same as clear |
| Glass cost | Baseline | About 60% more (October 2026) |
| Lead time | 1.5 to 2 weeks from the measure | Can run longer as a specialty glass |
| Best for | Small enclosures, bold hardware, dark finishes | Large panels, dim bathrooms, white or light tile |
Light, color, and hardness figures come from Vitro’s Starphire technical data. Cost and lead time come from our own work in Greater Seattle.
Why standard clear glass looks green
The raw materials in standard glass carry a small amount of iron oxide. That iron is what gives clear glass its slight green tint, and you see it most at the edge of a panel, where you’re looking through the full width of the glass.
On a thin pane, the tint is almost invisible. On a 3/8-inch shower panel, you can see it on the edges if you look. On a 1/2-inch panel, especially a tall one with long edges showing, the tint becomes a real visual element. Look at the edge of a sliding shower door head-on and you’ll see a soft green band running along the cut.
The tint also shows through the body of the glass. In direct natural light or under cool LED, the area behind a standard clear panel can read very slightly green. White subway tile behind clear glass looks just barely sage. Stone with warm undertones reads slightly muted.
That’s normal for the material, not a defect.
What makes Starphire different
Low-iron glass is made on the same float lines as standard glass, from purer raw materials with much less iron. Vitro says its Starphire is 87% less green than ordinary clear glass and stays clear even at 3/4 inch thick. At 1/2 inch, one of the two thicknesses we use for frameless shower doors, Vitro rates it at 90% visible light transmission.
Side by side with standard clear, low-iron looks like… nothing. It’s the closest glass gets to looking like nothing is there. Edges read pale blue-white instead of green. The colors of tile and stone behind the panel come through accurately. The shower hardware reads cleanly against it.
In the cabinetry world, this is the difference between standard plywood edges and matched edge-banding. Most people don’t notice until you point it out, and then they can’t unsee it.
What doesn’t change is the strength. Vitro rates Starphire’s surface hardness and abrasion resistance the same as standard clear, and it tempers the same way. It scratches no more easily and cleans the same.
Starphire vs. low-iron: a brand and a type
Low-iron is the type of glass. Starphire is Vitro’s brand name for it. Other manufacturers make their own low-iron glass, sold as plain low-iron or under their own names (Guardian UltraClear and Pilkington Optiwhite are two you’ll see).
So when we order glass for a shower, the first choice is standard clear or low-iron. If you go low-iron, the second choice is Starphire or another maker’s low-iron. The way I explain it: low-iron versus Starphire is BMW versus Mercedes. Both are the premium choice and both get rid of the green. Another maker’s low-iron can even be a little clearer than Starphire, and it usually costs a bit less. Either way, make sure your quote names which one you’re getting.
“Starfire” is usually just how people spell Starphire. But Vitro also makes a separate product that really is called Starfire. It’s a low-iron glass with lower purity than Starphire Ultra-Clear, made for industrial and equipment manufacturing. If a quote says Starfire, ask which one it means.
Is Starphire worth it?
Three situations where I almost always recommend low-iron glass:
Large openings and tall panels
The bigger the panel, the more edge there is to show the tint, and the more glass the light passes through. A 6-foot tall, 4-foot wide single panel in standard clear has visible green character. The same panel in Starphire reads neutral. On any heavy-glass installation in 1/2-inch material, low-iron is the right call.
Low-light bathrooms
North-facing bathrooms, basement bathrooms, and any space without strong natural light tend to amplify the green of standard clear because the artificial lighting often skews cool. Low-iron stays neutral under any lighting.
Design-first installs
When the shower glass is meant to disappear so the tile, stone, and hardware can carry the design, the tint of standard clear gets in the way. This describes most of what we install in higher-end remodels. The glass is intentionally not the focal point, so it has to read invisibly. Large panels against white or light tile make the case even stronger, because there’s a clean background to show the green against.
When standard clear is the better choice
Small enclosures with neutral tile
A standard tub-and-shower combo with white tile and chrome hardware looks fine in standard clear. The tint is barely perceptible at this scale, and the budget difference is real.
Hardware-driven design
When bold hardware carries the shower’s design, the eye goes to the hardware rather than the glass. Matte Black and Unlacquered Brass both have that kind of visual presence. The tint of standard clear doesn’t compete in that context.
Dark finishes and stone
Bathrooms with deep wall colors, dark stone, or heavily veined materials don’t show the green tint nearly as strongly because there’s less neutral background to compare it against. The tint reads as part of the overall atmosphere.
Two Clyde Hill homes, one of each
Two homes we did in Clyde Hill show both choices. On a $7.8M Clyde Hill build, we used Starphire across three frameless enclosures, a steam shower, and a multi-flight glass stair railing. On a newer $12M Clyde Hill home, we used standard clear throughout, including the floating staircase railing.
How much more does Starphire cost?
As of October 2026, Starphire runs about 60% more than standard clear for the glass itself. Other manufacturers’ low-iron glass usually comes in a little under that. That’s the material line only. Hardware, templating, and installation cost the same either way, so the total for your project goes up by less than that. How much less depends on how much glass is in the job. A large walk-in with tall panels lands closer to the full difference than a single door does.
Glass pricing also doesn’t swing the way lumber does. It holds steady and climbs slowly with inflation. In all my years doing this, I’ve never seen glass get cheaper, so waiting for a better price rarely pays off.
The cost is one-time. The glass is in for the life of the installation. On your written quote, the glass is its own line item, so you’ll see exactly what the upgrade adds for your opening.
In the Seattle area? We bring a clear sample and a low-iron sample to every free in-home measure, so you can hold both against your own tile before you decide. Book a free measure →
The downsides of low-iron glass
Low-iron has real tradeoffs, and they’re worth knowing before you pay for it.
- Cost. Starphire runs about 60% more for the glass, and other manufacturers’ low-iron a little less.
- Lead time. Standard custom work runs 1.5 to 2 weeks from the measure. Specialty glass like Starphire can take longer, and we tell you at the measure, not after the deposit.
- Replacement panels have to match. If one panel in a low-iron enclosure ever breaks, the replacement has to be low-iron too. A clear panel next to low-iron panels shows the difference right away.
- It isn’t colorless. The edge reads pale blue-white, not invisible. Most people like it, but it’s still a color.
- It doesn’t clean any easier. Low-iron changes the color, not the surface. Water spots and soap film need the same care on either glass.
Starphire and low-iron mirrors
A mirror is glass with a reflective coating on the back, so the same iron that tints a shower panel tints a mirror too. You see it on the polished edge and in how colors look in the reflection. A low-iron mirror shows a cleaner edge and truer color.
Most of the mirrors we install are standard clear, and for most rooms that’s the right call. When the edge or color accuracy matters, low-iron mirror is available as Starphire or from other manufacturers. In my experience another maker’s low-iron mirror can be a little clearer than Starphire mirror, and it costs less. If you’re planning a large custom mirror with exposed edges, ask what glass it’s made on.
How to tell if your glass is Starphire
If you’re comparing samples or checking what was installed, these checks work:
- Look at a polished edge. Standard clear shows a green band. Low-iron shows pale blue-white.
- Hold white paper behind the glass. Through standard clear, the paper looks faintly green. Through low-iron, it stays white.
- Put the two side by side. On their own, either one can pass for clear. Next to each other, the difference is obvious within seconds.
Where low-iron matters beyond showers
Any glass with an exposed edge shows the same tint. Vitro markets Starphire for stairs and handrails, partitions, and shower enclosures for exactly that reason.
- Glass railings. A frameless railing shows a long exposed top edge, and on stair glass railings you see it every time you walk past.
- Glass countertops and vanity tops. The edge sits in your sightline every time you use the sink.
- Glass wall partitions. Tall panels with exposed edges, often set against white walls.
How we handle it on every project
When we measure for a custom shower or railing, we walk through glass options on site with samples. Edge views of clear and low-iron held up against the actual tile, stone, and hardware tell you more in two minutes than any showroom can. Most of the time the choice becomes obvious once you see them in the actual space.
The upgrade isn’t always right. But on projects where the glass is meant to read as cleanly as possible, the difference is visible from the first look at the finished install. That describes most of the frameless work we do across Greater Seattle.
If you’re planning a project and want to see the difference in person, we bring both samples to every free in-home consultation. Get a free in-home consultation →
