I used to think all fog machine liquid was the same. Never once had I considered that a new fog formula could be far better than what I've been using for decades. PMI's Vanishing Formula Kit has changed my opinion, and today I test it against three of the most popular portable fog systems on the market.
Portable fog machines have become one of my favorite tools for photography and filmmaking. Whether I'm shooting portraits, product photography, miniatures, or cinematic video, adding a little smoke, mist, or haze can instantly elevate a scene.
The problem is that traditional fog fluids come with a long list of compromises. Most portable fog machines use a relatively high-percentage glycerin or glycerol-based formula. While these formulas can create beautiful smoke effects, they often leave behind an oily residue on surfaces, can clog internal components over time, may trigger smoke alarms, and frequently fill an entire room with haze that takes 10 to 30 minutes to clear out.
PMI, the company behind the popular portable fog machine Smoke Ninja Pro, believes it has solved these problems with its newly released Vanishing Formula Kit. According to PMI, the kit is the world's first fog system designed to be both residue-free and smoke-detector-free while still producing dense, usable fog effects.
After reading the claims, I was skeptical, so I decided to put the system through four real-world tests to see if it actually delivered.
What Is the Vanishing Formula Kit?
The Vanishing Formula Kit isn't simply a new bottle of fog fluid. It consists of three components:
- A new Vanishing Formula liquid
- A redesigned VF heating chamber
- A new amplifier nozzle
According to PMI, the formula and hardware were developed together over the course of more than a year. The company claims the fluid uses food-safe ingredients and relies on unique evaporation properties that allow it to disappear from surfaces much faster than traditional fog fluids.
The hardware is equally important. PMI says the new fluid requires extremely precise temperature and pressure control to vaporize the liquid in a safe and consistent way. Because of this, the Vanishing Formula only works with the dedicated purple VF chamber and amplifier nozzle. Users cannot mix the new formula with standard Smoke Ninja fluid or use it in older chambers.
PMI makes four major claims:
- No residue on surfaces
- No liquid spitting from the machine
- Reduced risk of triggering smoke detectors
- Extremely fast dissipation without filling a room with haze
Those are bold claims, so I decided to compare the system against several competing portable fog machines.
The Test Setup
For testing, I gathered four battery-powered handheld fog machines:
- CF3 by Colbor (the update to the popular CF5)
- Smoke Go by LensGo
- C40 by Telesin
- Smoke Ninja Pro with the Vanishing Formula Kit
I also included a can of Atmosphere Aerosol for comparison during the early testing stages. Each unit was charged overnight and filled with fresh fluid before testing began.
Test #1: Residue
The first test focused on one of the biggest complaints photographers have about fog machines: residue.
I ran each machine continuously for three minutes and allowed the fog to settle onto a glossy black acrylic sheet. After waiting 30 minutes, I wiped the surface with my finger to see what remained. The acrylic sheet acted as a stand-in for fabrics, products, collectibles, jewelry, and other surfaces photographers frequently work around.
The results were surprisingly clear.
Half of the units left a visible oily film after only three minutes of operation. The only two machines that did not leave residue were the Smoke Ninja using the Vanishing Formula and the LensGo Smoke Go. However, the LensGo produced significantly less smoke and sprayed liquid throughout the surrounding area. While the acrylic itself remained clean, the surrounding V-flat became messy enough that I hesitate to call it a complete success.
Out of curiosity, I even sprayed the Vanishing Formula directly onto the acrylic surface. It still left no visible residue.
Winner: Smoke Ninja Pro with Vanishing Formula.
Test #2: Liquid Spitting
If you've used portable fog machines for any length of time, you've probably seen them spit droplets of hot liquid from the nozzle. This not only creates a mess but can also damage products or surfaces.
For the second test, I cleaned each unit and again ran them continuously for three minutes.
The results were dramatic.
Most of the competing machines sprayed fluid onto the surrounding surface. In fact, the residue was significant enough that I believe it permanently stained my V-flat.
The Smoke Ninja with the Vanishing Formula did not spit a single drop. Not only was the surrounding area clean, but there was no residue on top of the unit itself. PMI attributes this to its new v3.0 liquid-blocking chamber design, which was specifically engineered to prevent fluid from being expelled through the nozzle.
Winner: Smoke Ninja Pro with Vanishing Formula.
Test #3: Smoke Detector Triggering
This was the test I was most interested in. Over the years, I've accidentally triggered my share of smoke detectors while using fog machines. Modern photoelectric detectors don't necessarily detect smoke itself. Instead, they monitor a beam of light and trigger when particles disrupt it. Smoke, haze, vapor, and even steam can cause problems.
For this test, I mounted a photoelectric smoke detector exactly eight feet away from the testing area. PMI specifically claims the Vanishing Formula is engineered to dissipate within an eight-foot radius and should not trigger a detector placed at that distance.
Each machine ran for three minutes, and then I let the fog float in the room for an additional 15 minutes.
Interestingly, none of the machines triggered the alarm while actively running. However, after shutting them off and waiting, the lingering particles eventually caused every competing machine to trigger the detector.
The Smoke Ninja with the Vanishing Formula never triggered the alarm, even after a 15-minute observation period.
This was perhaps the most impressive result of the entire test.
Winner: Smoke Ninja Pro with Vanishing Formula.
Test #4: Dissipation Time
For the final test, I wanted to see how quickly the fog disappeared.
Again, each machine ran continuously for three minutes. I then periodically left and re-entered the room over a 30-minute period to judge how much haze remained.
The difference was obvious.
The Vanishing Formula cleared the room in approximately two to three minutes. PMI claims even faster dissipation under ideal conditions, but in my studio the room felt essentially smoke-free within a couple of minutes.
The other machines continued to leave visible haze throughout the studio for more than 30 minutes. Even after half an hour, backlighting the room easily revealed lingering particles in the air.
For photographers who need to quickly reset a set, change lighting, or move on to the next shot, this difference is enormous.
Winner: Smoke Ninja Pro with Vanishing Formula.
Who Is This Product For?
After testing, I think the Vanishing Formula is ideal for:
- Product photographers
- Jewelry photographers
- Miniature and tabletop photographers
- Portrait photographers
- Wedding photographers working indoors
- Studios with smoke detectors nearby
- Creators who need repeated smoke effects without filling a room with haze
The biggest advantage isn't necessarily the smoke itself. It's how quickly you can move on to the next shot without waiting for the room to clear.
What Isn't It Good For?
As great as the Vanishing Formula is, it isn't a complete replacement, depending on the specific fog effect you need. If your goal is thick atmospheric haze that hangs in the air for several minutes, the original fog fluid (Cloud Formula) is still the better option. Music videos, dramatic cinematic scenes, concert environments, and large-scale productions often rely on smoke lingering in the environment.
Because the Vanishing Formula dissipates so quickly, it isn't particularly well suited for creating a room-wide haze effect or visible light beams that need to persist throughout an entire scene.
It's also important to remember that the Vanishing Formula requires its own dedicated chamber and fluid. You cannot mix the traditional Smoke Ninja fluid with the new formula without risking performance issues or clogging.
Final Thoughts
I went into this test expecting at least one of PMI's claims to fall apart under real-world conditions. Instead, the Vanishing Formula exceeded my expectations.
Across all four tests—residue, liquid spitting, smoke detector triggering, and dissipation speed—the Smoke Ninja Pro with the Vanishing Formula outperformed every competing handheld fog machine I tested.
It's not the right tool for every smoke effect, but for photographers and videographers who need clean, controllable fog indoors, it may be one of the most useful innovations in portable atmosphere effects we've seen in years.
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