SCIENCE Knowledge Hub · DetectLead

Founder Story

How FluoroSpec Was Developed

A chemist, a Columbia researcher, and a lead-safety mission, the inside story of how FluoroSpec came to be, and why the science that powers it belongs to everyone.

Where It Started

FluoroSpec didn't begin in a vacuum. The detection chemistry at its core, methylammonium bromide (MABr) reacting with lead ions to produce bright green perovskite quantum dots, was first documented in peer-reviewed scientific literature in 2019 by researchers at Beijing Jiaotong University. That paper, published in Scientific Reports (Nature Research), demonstrated the method on paper test strips with a detection limit of 1 nanogram. The chemistry was in the public domain.

Eric, FluoroSpec's founder, came to this chemistry through a different path: a deepening obsession with the lead crisis in America, years of hands-on testing, and direct collaboration with the researchers who would eventually try to commercialize the same method.

The Collaboration

Working with Lumetallix Researchers and Dr. Alexander van Geen

Eric worked directly with the founders of what became Lumetallix on an early-stage limit-of-detection study. The goal was to characterize how sensitively the MABr perovskite method could detect lead in painted surfaces, specifically the kinds of lead-painted china and dishware that make their way into American homes.

The study also involved Dr. Alexander van Geen, a geochemist at Columbia University's Lamont-Doherty Earth Observatory and one of the world's leading researchers on lead exposure in low- and middle-income countries. Dr. van Geen's lab has published extensively on field-deployable lead testing methods and their implications for public health.

The study was eventually published. Eric's involvement gave him direct knowledge of the method's strengths and its limitations, and led him to two conclusions that would define FluoroSpec's development.

2019

The Science Is Published

Yan et al. publish "Determination of lead(II) via methylammonium lead bromide perovskite quantum dots formed from methylammonium bromide" in Scientific Reports. The MABr detection method, the same chemistry used by both FluoroSpec and Lumetallix, is now freely available peer-reviewed prior art.

2021–2022

The LOD Study and the Patent Conversation

Eric collaborates with the team that becomes Lumetallix and with Dr. van Geen on a limit-of-detection study. During this period, Eric raises a direct concern: the MABr lead-detection method cannot be meaningfully patented. The core chemistry is prior art. The USPTO would later agree.

2023

Lumetallix Files the Patent

October 3, 2023, U.S. Application 18/285,431 (Helmbrecht et al.) is filed, attempting to patent the MABr method on specific surfaces. Eric's assessment: the application is fatally flawed from the start because Yan 2019 and multiple other prior art documents already teach the identical chemistry on solid substrates.

2024–2025

FluoroSpec Launches Independently

Eric builds FluoroSpec with four key improvements over what he observed in the early collaborative work: higher MABr concentration, larger reagent volume (60 mL vs 19 mL), a precision drip-tip dispenser, and fully US-based manufacturing under TSCA DEA List 1 chemical handling authorization. He manufactures MABr himself, vertical integration that ensures consistent quality and supply.

March 2026

USPTO Rejects All 15 Claims

Examiner John McGuirk issues a Non-Final Office Action rejecting every claim in Application 18/285,431, citing Yan et al. 2019 as primary prior art and finding all claims indefinite under § 112(b). The verdict Eric predicted years earlier.

The Methodology Question

A Concern About the LOD Study

The limit-of-detection study mixed modern paint formulations with vintage Dutch Boy lead-based paint to create test samples. Eric's concern: vintage Dutch Boy paint and modern architectural paints contain different lead compounds, primarily lead carbonate (PbCO₃) in vintage formulations versus more varied lead speciation in modern samples. Mixing these introduces variability in lead compound form that may not represent how lead actually appears in real-world painted china, glazed ceramics, or vintage dishware.

This matters because the MABr detection reaction's kinetics differ across lead compound types. Lead carbonate is highly reactive; other forms may be slower to dissolve and react. A reported detection limit derived from a mixed sample may not accurately reflect performance on the surfaces consumers are most concerned about.

Eric did not publish these concerns in the study. He built FluoroSpec's validation testing on real-world substrates instead.

What Eric Built Differently

Higher MABr Concentration

More reagent drives the perovskite formation equilibrium further, producing a brighter signal at low lead loadings.

60 mL vs 19 mL

Three times the reagent volume means three times the tests, before accounting for the dispenser efficiency gain.

Precision Drip-Tip

Single-drop "tap to test" delivery uses ~10× less reagent per test versus Lumetallix's spray format, yielding ~100+ tests per bottle.

US Manufacturing

Manufactured in the United States under TSCA DEA List 1 chemical handling authorization, a regulatory bar most sellers of this chemistry cannot meet.

Vertical MABr Production

Eric manufactures methylammonium bromide himself. No third-party supplier dependency means consistent purity and reagent performance.

No Patent Games

FluoroSpec is built on publicly available, peer-reviewed science. The method belongs to everyone. The product is better because of better execution.

Why the Patent Was Always Doomed

Eric's early read was straightforward: the MABr perovskite detection method was already in the scientific literature. You cannot patent a published chemical method by specifying new substrates, "painted china" instead of "paper test strips" is an obvious modification, not an invention. The USPTO agreed in March 2026, citing Yan 2019 as anticipatory prior art for all independent claims.

"The method was already demonstrated on paper. Saying you invented the same method on ceramic is not innovation, it's a filing fee."

Eric shared this concern directly with the Lumetallix team before and during prosecution. The prosecution history, the non-final office action rejecting all 15 claims, is now public record.

Read the full USPTO examination record →

The Product That Came From This Work

Everything Eric learned through collaboration, debate, and independent testing went into FluoroSpec. More reagent, stronger signal, smarter dispenser, US-made, and the knowledge of a chemist who helped develop the science and then built it better.

Shop FluoroSpec FluoroSpec vs. Lumetallix →