RMS Beauty · Eyeliner
RMS Beauty Straight Line Kohl Eyeliner Duo
Lower concern; typical mineral kohl eyeliner with no known PFAS risks, but brand offers no transparency.
RMS Beauty's kohl eyeliner appears to use standard mineral and wax pigment formulations common to eye cosmetics, which are not typical PFAS application areas. The brand has not published PFAS commitments or testing data.
Shop RMS Beauty on Amazon →Material
Pigmented mineral wax pencil (typical kohl formulation)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
cosmetics is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
RMS Beauty Straight Line Kohl is a pigmented mineral wax pencil, the standard formulation for eyeliners in this category. Mineral-based kohls use iron oxides, mica, and waxes (often beeswax or plant-derived) as binders rather than synthetic polymers or silicones. This material class avoids many synthetic eyeliner hazards like phthalates and certain volatile organic compounds, though the specific pigment sources and any trace contaminants depend on supplier quality.
The brand's record and disclosure
RMS Beauty markets itself as a clean beauty brand emphasizing mineral and plant-based ingredients, but does not publish full ingredient decks or third-party safety certifications for individual products. The brand has no documented recalls or safety controversies on record. However, the company remains silent on PFAS testing and heavy metal screening, which is standard practice even for clean brands; this absence of transparency rather than evidence of harm should inform your confidence level.
How it compares in its category
Mineral kohl pencils like this one sit at the safer end of eyeliner formulations compared to liquid liners with film-forming polymers or pencils with synthetic binders. Comparable products (Bobbi Brown, MAC, Clinique kohl pencils) use similar mineral wax bases. RMS's positioning is mid-market clean beauty rather than luxury or budget, which typically correlates with slightly higher ingredient scrutiny but not necessarily third-party verification.
If you buy it
Store the pencil away from direct heat to prevent wax migration or softening. Replace every 12-18 months or when the tip becomes ragged to avoid bacterial buildup at the eye line. Do not sharpen with a dull blade, as this can cause the pencil to crumble and deposit particle fragments near the eye. Discontinue use if irritation develops, which may indicate sensitivity to a wax component or a particular pigment batch.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Heavy metals in iron oxide pigments
Iron oxides are FDA-approved colorants in cosmetics, but supplier purity varies. RMS does not publish heavy metal screening data for this product, so independent assurance is unavailable.
Formaldehyde or formaldehyde releasers in preservative systems
Mineral wax pencils typically do not require aqueous preservatives, reducing the need for formaldehyde-releasing agents common in water-based formulations. No public reports link this product to formaldehyde contamination.
Talc or talc-like mineral contamination
The product does not list talc in available ingredient disclosures, though mica (a talc alternative) may carry trace asbestos contamination if sourced from low-regulation suppliers. RMS does not certify asbestos-free status.
Fragrance allergen or sensitization risk
RMS Beauty products often contain plant-derived fragrance or essential oils; full fragrance disclosure is not published for this eyeliner, so individual sensitization cannot be predicted without ingredient transparency.
Microbial contamination if pencil tip contacts eye repeatedly
Pencil eyeliners are applied directly to the eye line and sharpened frequently, creating opportunities for bacterial seeding if the sharpener is not clean. This is a handling and storage risk, not a formulation defect specific to RMS.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More eyeliner grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.