Nano Ark lab results:
E. coli and 3 mold species

Two independent lab tests confirming Nano Ark's effect, plus an in-house comparison — published with their conditions, figures and report scans.

E. coli test Mold test (3 species) Comparison Report scans

Dishes after incubation: left, saline control with many E. coli colonies; right, Nano Ark with almost none. — Control (saline)Nano Ark

E. coli test

June 2021 | Okinawa Environmental Science Center (一般財団法人沖縄県環境科学センター)

In a June 2021 test by the Okinawa Environmental Science Center, E. coli on dishes sprayed with the Nano Ark photocatalyst solution fell to 40 cfu/dish after 24 hours under 1,350-lux fluorescent light — a 99.989% reduction compared with the saline control (3.75×10⁵ cfu/dish).

Residual bacteria per dish after the test (cfu/dish)
Organism	Control (saline)	Nano Ark
E. coli	3.75×10⁵	40

99.989%Reduction vs. control (as stated in the report)

Test conditions
Inoculum	100 µl of standard E. coli suspension applied with an automatic plater (2.78×10⁶ cells per dish after drying)
Treatment	Sprayed with the photocatalyst solution, or with saline (control)
Light	Fluorescent light, 1,350 lux, 24 hours, inside a safety cabinet
Measurement	Swabbed, cultured on standard agar at 35±1 °C for 24±2 hours, colonies counted

Nano ArkControl (PBS)

Penicillium: left, Nano Ark dish with no mold; right, control covered in mold.

Cladosporium: left, Nano Ark dish with no mold; right, control with many green colonies.

Trichoderma: left, Nano Ark dish with no mold; right, control fully covered.

Mold test — 3 species

May 2022 | Report no. 2021-B-02641-01 | Okinawa Environmental Science Center

In a May 2022 test by the Okinawa Environmental Science Center (report no. 2021-B-02641-01), Penicillium, Cladosporium and Trichoderma were not detected on dishes sprayed with the Nano Ark photocatalyst solution after 72 hours under fluorescent light, versus 6.27×10⁵, 5.57×10⁴ and too-numerous-to-count cfu/dish on the PBS control.

Residual mold per dish after the test (cfu/dish)
Species	Control (PBS)	Nano Ark
Penicillium	6.27×10⁵	0
Cladosporium	5.57×10⁴	0
Trichoderma	TNTC^*	0

None detected72 hours under fluorescent light

* Too Numerous To Count. Measured at 1.77×10³ after 2 days of incubation.

* Both are laboratory results under test conditions. Results may differ in real installations (lighting, humidity, surface condition); the effect is not guaranteed.

* The Okinawa Environmental Science Center performed the tests; it does not certify or endorse products.

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Reference: our in-house comparison

6 / 1,410ATP reading after 3 hours (Nano Ark / competing product, RLU)

Using ATP swab testing (Lumitester), we compared surfaces treated with Nano Ark and with a competing product. ATP readings indicate the amount of organic contamination, including bacteria.

* An in-house reference test by A-ARK, separate from the Okinawa Environmental Science Center tests.

* The competing product is not named for confidentiality reasons. Values are readings at each time point; results vary with conditions. No starting value is recorded for the competing product, so its line starts at 1 hour.

* Starting conditions could not be confirmed as identical, so this does not show that either product is better.