The lists on the internet are other people's bottles. FluoroSpec tells you about the one in your hand. One drop. Thirty seconds. The painted measurement marks light up green under UV if they were made with lead-bearing pigment. Plain plastic stays dark.
Most parent-facing bottle data comes from public-interest groups that tested a handful of brands during one quarter of one year. The brands change formula. The lots change supplier. The print contract moves to a different shop in a different country. A bottle that was clean in 2023 fails in 2025 because nobody re-tested when the contract switched.
The bottle you actually use, not the brand average. The chemistry does not care about disclosure paperwork.
The ml and oz numbers, any printed graphics, character faces. Plain plastic and silicone are inert and stay dark.
The isopropanol carrier flashes off. The methylammonium bromide stays bound to the surface, finding any lead ions in the pigment.
Green glow on the print means the pigment used lead. No glow means it was made without. Bright green is unmistakable, even in daylight.
The FDA Interim Reference Level for children is 2.2 µg per day total. There is no safe lower bound. Brain damage from chronic low-dose exposure is cumulative and does not reverse with age.
Three moves, ranked by what cuts the actual dose fastest. The bottle on the counter today is the priority. The bottle in the cabinet next week is the next priority.
Heat accelerates lead release from the painted layer. Cold breast milk in a clean glass bottle is much lower-dose than warmed formula in a painted one. This is the highest-leverage change you can make in the next ten minutes.
Plain glass, food-grade silicone, or plastic with no printed marks. The kit pays for itself the first time it screens a replacement before the first bottle of formula goes in it.
Two photos, one form, ninety seconds at /add-a-bottle. PII strips off. The brand, lot, and verdict join the dataset so the next parent does not have to guess on the same bottle you just diagnosed.
Painted ceramic dishes and printed plastics behave the same way on this dimension. Citrus, tomato, coffee, and any warmed feed are the highest-leach situations. The painted decoration is fine on display. It is not fine under hot formula.
The FS1D fits in a kitchen drawer. Two bottles, one UV lamp, one color card. Lifetime use. Refills are cheap. The first bottle you screen will tell you whether you needed the kit or whether you got lucky.
