Our Desk-Research Self-Tanner Scoring Method

Proposed future controlled testing protocol

This protocol will only be used after recruitment, consent, products, and test records are actually in place. It is designed to make future observations comparable while keeping the current research scorecard separate.

1. Participant context and representation. Record participant context, including self-described skin-tone and undertone representation, prior self-tan experience, relevant routine variables, and the intended body area. A future sample should seek representation across skin-tone and undertone contexts; this is a recruitment objective, not a claim that a panel is currently recruited.
2. Product identity and source. Before use, record the exact SKU, shade or variant, lot or batch, purchase channel, package condition, and expiry or period-after-opening mark. Photograph the package and retain the label record so later formula or label changes are traceable.
3. Controlled preparation and application. Use standardized preparation: wash, shave timing, moisturizer use, skin moisture, and recorded environment. Record dose, body area, applicator tool, application order, and timing; follow the exact product label rather than borrowing another product's instructions.
4. Immediate observations. Record dry-down time, tack, transfer check, and scent before rinsing at the time specified on the label. Record rinse timing and immediate color without treating that early observation as the final developed result.
5. Photography. Take baseline, post-rinse, and scheduled photos using the same lighting, camera position, exposure, and white balance. Keep framing, distance, body area, and reference treatment consistent; photographs document conditions and do not replace individual context.
6. Consent and stop rules. Obtain informed consent, adverse-event reporting, and stop criteria before any application. Stop the session and record the event if a participant requests it or reports discomfort, irritation, or another concerning change; this protocol does not support medical, safety, or non-irritation conclusions.
7. Wear, fade, and removal follow-up. At Day 1, Day 3, Day 5, and Day 7, record color, fade, patchiness, transfer, odor, and comfort under the same observation rules. Record the removal outcome separately, including the method, timing, and any stopped or incomplete step.
8. Missingness and scoring. Log protocol deviations and missingness rather than filling gaps with an assumption. Future reporting will score only completed dimensions, show the denominator and missing dimensions, and distinguish observed facts, editorial judgments, and participant anecdotes. Use reviewer blinding where feasible for photo or record review, while documenting when blinding was not feasible.

Implementation checklist

• Recruitment and representation plan approved before enrollment; no claim of current recruitment.
• Consent, stop criteria, adverse-event log, data retention, and escalation process ready before product application.
• SKU/batch/source log, preparation checklist, application record, scheduled follow-up form, and photography setup piloted before testing begins.
• Protocol deviations, missingness, raw observations, and review roles retained with each result; no score is calculated for an incomplete dimension.
• Every published protocol result gets a correction and freshness record naming product identity, test dates, protocol version, data limitations, and any material update.

The 9-dimension research scorecard

Only products with reviews confidently matched to the exact formula receive a public rank. Each ranked self-tanner receives a 0-10 research score on the same dimensions, using the published weights below. Every review page explains the source behind each score. Unmatched products stay on the unranked watchlist with N/A scores.

Reproducible formula: weighted score out of 100 = the sum of each 0-10 sub-score multiplied by its percentage weight, divided by 10. TheTanList retains one decimal place; the weights total 100%.

Score anchors and coverage grades

• 9-10: among the strongest signals in the ranked set.
• 7-8: competitive, with clear tradeoffs.
• 5-6: important limitations compared with the other ranked products.
• N/A: no confident exact-product review match, so TheTanList does not estimate a performance score.

Coverage grades describe how many reviews we could match, not product quality or statistical certainty: B means at least 75 confidently matched review URLs; C means 40-74; U means no confident match and therefore no rank. No product receives an A because the capture is rating-stratified, self-selected, and not a controlled or representative study.

Why these weights

The weights are an editorial prioritization model. Color and streak control receive the most weight; smell, transfer, and fade follow; conservative formula screen, shade range, retailer coverage, and value keep the ranking from reducing every decision to color depth. Face use is excluded until exact label approval is verified.

The review set informed which failure modes deserve explicit coverage, but review set frequency was not converted directly into the weights. The finder reweights the same dimensions for an individual use case instead of pretending one default weighting fits everyone.

Evidence sources and dates

• Source capture. 1,684 rows and 1,175 unique review URLs across 30 Amazon listings, collected May 3, 2026.
• Formula subset. After excluding one standalone applicator-kit listing (58 captured rows; 49 unique URLs), 1,626 captured rows and 1,126 unique formula-review URLs across 29 listings remained; 1,116 were marked verified.
• Sampling design. Of 1,126 deduplicated formula-review URLs, 866 appeared only in rating-filtered helpful slices, 92 appeared only in recent-all or validation slices, and 168 appeared in both. The mix supports issue discovery, not prevalence claims.
• Theme tags. Word-based matches for ease, streaks, smell, format, skin-tone fit, orange cast, transfer, fade, and related subjects. A mention is not automatically a complaint.
• Product-level samples. Each review page names the matched listing scope and unique-review count, or states when no safe match exists.
• Product and retailer surfaces. Price, rating, review total, shade, size, and availability snapshots captured May 2, 2026. They can change and should be verified before purchase.
• July editorial review. Titles, descriptions, evidence labels, internal links, and decision paths were reviewed July 10, 2026.

Known limitations

• No hands-on test panel. We cannot claim texture, wear time, scent strength, transfer, or fade from direct observation.
• No representative sample. Amazon reviews reflect self-selected reviewers, rating-stratified sampling, and the listings captured.
• Word-based tags are not sentiment. Phrases such as "not orange" can still trigger an orange-language tag.
• Four assessed products are unranked. Products without a confident exact-product review match show N/A instead of performance scores or a total.
• Snapshot fields age. Prices, retailer coverage, ratings, formulas, and review totals need live verification before purchase.

When a score changes

A score changes only after a material evidence update: a formula or shade change, a corrected product match, a refreshed retailer snapshot, a larger validated review set, or documented original testing. A rebuild alone does not advance publication dates or create new evidence.

Disagree with our weights?

That is expected. The default score is a navigation aid, not a universal truth. Read the sub-scores, use the self-tanner finder, and choose the tradeoff that matches your routine.