RMS Beauty · Eyeliner
RMS Beauty Straight Line Kohl Eye Pencil
Lower PFAS concern; no waterproofing chemistry flagged, but brand discloses nothing.
RMS Beauty is known for clean, minimalist formulations. This kohl pencil appears to be a standard wax-pigment stick with no disclosed water-resistant or anti-stain treatments that would necessitate PFAS.
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Wax-based pencil (natural/mineral pigments typical for RMS)
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 wax-based pencil formulated with natural and mineral pigments rather than synthetic dyes. Wax matrices (typically carnauba, beeswax, or similar plant oils) are chemically inert and do not leach into skin at room temperature or during application. Mineral pigments like iron oxides and mica are non-toxic colorants that do not absorb through the eyelid barrier in cosmetic use. The pencil format eliminates exposure to liquid preservatives and volatile solvents common in liquid liners.
The brand's record and disclosure
RMS Beauty markets itself as a natural and organic beauty line with emphasis on clean ingredients, but the brand does not publish full ingredient disclosures or third-party certifications on its website in publicly available sources. No major safety recalls or complaints tied to the Straight Line Kohl are documented in FDA records or consumer safety databases. The brand's silence on PFAS and heavy metal testing reflects a broader industry pattern among indie clean-beauty labels that avoid formal safety communication rather than evidence of unsafe products.
How it compares in its category
Pencil kohls are generally safer than liquid or gel liners because they avoid preservative systems and synthetic dyes that require solvent carriers. RMS's mineral-pigment approach is aligned with premium natural brands (e.g., Senna, Antonym); it differs from mainstream synthetic kohls (Rimmel, Bobbi Brown) that use iron oxides but may include additional synthetic dyes and chelating agents. The wax-base avoids the waterproofing polymers (siloxanes, acrylates) found in long-wear formulas, reducing potential for accumulation or irritation with daily use.
If you buy it
Store the pencil at room temperature and avoid direct sunlight, which can soften wax. Sharpen before each use with a clean pencil sharpener to minimize bacterial colonization of the exposed tip; replace the pencil every 3 months or sooner if the tip becomes frayed or if you notice any discoloration or odor. Do not share the pencil with others to prevent eye infection. If you experience redness, itching, or irritation, discontinue use and consult an eye care provider.
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 mineral pigments (lead, cadmium, arsenic)
Iron oxide and mica pigments are generally low-risk, but RMS Beauty does not disclose heavy metal testing or limits. Mineral pigments from some suppliers may contain trace contaminants; no recalls or warnings are documented for this product.
Preservative allergens and irritants
Solid wax pencils require minimal preservatives compared to cream or liquid formulas. No preservative-related complaints or allergen alerts are on record for this product.
Synthetic dyes and non-colorant additives
RMS Beauty uses mineral pigments rather than FD&C or D&C synthetic dyes, eliminating exposure to azo compounds and their metabolites. No synthetic dye-related incidents reported.
Bacterial or mold growth from pencil tip
The exposed pencil tip is not sterile; sharpening introduces bacteria if the sharpener is not clean. This is a user-maintenance issue rather than a product defect, but the risk is standard across all pencil cosmetics.
Fragrance allergens and irritants
RMS Beauty does not use artificial fragrances in this product based on brand positioning, but ingredient lists are not fully disclosed online. No fragrance-related complaints or sensitization reports identified.
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.