What sensitizer documentation makes cyanotype Patreon content retentive at the concentration and paper-selection level?

The finished print photograph shows the result. The documentation covers the sensitizer preparation and coating decisions that produced that specific Prussian blue density and shadow-to-highlight range. The classic cyanotype sensitizer is a two-solution mixture: Solution A is ferric ammonium citrate dissolved in distilled water (typically 20–25% w/v), and Solution B is potassium ferricyanide dissolved in distilled water (typically 8–10% w/v). Solutions A and B are mixed in a 1:1 ratio by volume immediately before coating and discarded after the session — the mixed sensitizer has a limited pot life because the ferric salt and ferricyanide begin to react even in darkness at room temperature. Sensitizer concentration documentation covers the exact percentage for each solution, the water volume per solution, and whether distilled or filtered tap water was used (tap water mineral content affects print quality). Paper selection documentation covers the paper weight in grams per square meter (gsm), the manufacturer and product name, the surface sizing (heavily sized papers like Arches Platine limit sensitizer penetration and produce prints with cleaner highlight retention; unsized papers like some watercolor papers allow deeper penetration and produce slightly higher maximum density with more textured shadow zones), and the coating method (flat brush vs foam brush vs rod coater, each producing different coating weight and uniformity). Drying conditions documentation covers the drying time in darkness (sensitized paper must dry fully before UV exposure — damp paper produces flat, low-contrast prints because the iron ions are too mobile; overdried paper exposed in very dry conditions may show different contrast behavior than paper dried at standard humidity).

What tier structure works for cyanotype creators on Patreon?

Cyanotype creators typically structure two or three tiers: Print Notes ($12–18/month) provides sensitizer preparation documentation for each print series (solution concentrations, paper selection, coating method, drying conditions, UV exposure time at the ambient UV index on the print day, toning protocol if used), plant selection and arrangement documentation for botanical contact prints (species identification, freshness state at time of printing, hydration level and surface moisture, direct vs glass-pressed contact), and finished print photographs with processing notes. Studio Intensive ($40–65/month capped 8–10 patrons) adds monthly personal critique of patron-submitted cyanotype work: the creator reviews photographs of the patron's prints and provides specific notes on sensitizer density, exposure calibration, toning outcomes, and plant selection for botanical work. The UV calibration documentation is the deliverable that patrons cannot reconstruct from print photographs alone — the photograph shows the finished density but not the UV index, the exposure duration, the time of day, the season, and the cloud cover fraction that produced that exposure. UV conditions vary so dramatically between sessions and locations that a patron following only exposure times from a creator in a different climate would produce systematically incorrect results. The documented calibration protocol (step wedge, target density zones, UV index reading at session start) is what allows patrons to transfer the creator's approach to their own conditions.

How does the Apple Tax affect cyanotype creator Patreons?

Cyanotype creators have moderate iOS exposure that varies by platform. Instagram botanical cyanotype photography: 72–82% iOS — cyanotype botanical prints are highly visual and discovery-driven on Instagram, consumed primarily through mobile feed and Explore. TikTok alternative photography process clips (sensitizer coating, UV exposure reveals, wash-out sequences): 65–75% iOS — TikTok's alternative photography community is smaller than mainstream craft niches but skews mobile-heavy. YouTube cyanotype and alternative process tutorials: 55–65% iOS — tutorial content attracts above-average desktop viewing from photographers who reference techniques while working at a darkroom bench. In dollar terms: a cyanotype creator at $200/month with 70% iOS faces approximately $42/month ($504/year) in Apple fees beginning November 1, 2026. A creator at $350/month with 75% iOS faces approximately $78.75/month ($945/year). Enable Patreon's web-only billing toggle before October 31, 2026. Update Instagram bio and TikTok profile links to point directly to the Patreon web URL. Verify the complete subscription flow from an iOS device before November 1 to confirm no iOS billing dialog appears.

Explainers · 2026-07-03 · ~1,500 words

Patreon for cyanotype creators: tiers, sensitizer documentation, UV exposure calibration, toning chemistry, iOS rates, and the Apple Tax in 2026

Cyanotype creators on Patreon retain patrons with the documentation layer that print photographs and finished-work posts structurally omit: sensitizer solution concentration and paper selection rationale, UV exposure calibration protocol with step wedge data, toning chemistry outcomes, and wash sequence documentation. The cyanotype and alternative photography audience spans Instagram, TikTok, and YouTube with moderate iOS rates — the November 1, 2026 Apple Tax warrants action before October 31.

Creator types and tier structure

Botanical contact print artists

Tier structure: Print Notes ($12–18/month, sensitizer preparation and coating documentation, plant selection notes, UV exposure data, finished print photographs), Studio Intensive ($40–65/month capped 8–10, monthly personal critique of patron-submitted cyanotype work with specific notes on sensitizer density, exposure calibration, and botanical arrangement).

The cyanotype process produces Prussian blue (iron(III) hexacyanoferrate(II), Fe&sub4;[Fe(CN)&sub6;]&sub3;) through a photochemical reduction reaction. Ferric ammonium citrate (Fe(III)) in the sensitizer is reduced to ferrous iron (Fe(II)) by UV light. The ferrous iron then reacts with potassium ferricyanide (K&sub3;[Fe(CN)&sub6;]) to form Prussian blue at the exposed areas. Unexposed areas retain the soluble ferric compounds and are washed away, leaving the white paper in the shadow zones. The density and blue saturation of the Prussian blue deposit depends on the amount of ferric ammonium citrate reduced, which depends on the UV exposure dose (intensity × time), the sensitizer concentration, and the paper's ability to hold the iron compounds in a reactive state during exposure.

Sensitizer concentration documentation covers Solution A (ferric ammonium citrate, typically 20–25% w/v in distilled water) and Solution B (potassium ferricyanide, typically 8–10% w/v) measured and mixed 1:1 by volume. The documentation note covers the specific percentage for each solution, the water source, and the freshness of the solutions. Paper documentation covers the paper weight (gsm), manufacturer and product name, and surface sizing. Unsized papers allow deeper iron penetration and produce higher maximum shadow density but less clean highlights; heavily sized papers restrict penetration to the surface fibers and produce cleaner highlights with a ceiling on maximum density. Both are valid choices documented at the level of their trade-offs.

Botanical plant selection documentation covers species, freshness state (just-picked, wilted, pressed-and-dried), moisture level on the surface at time of printing, whether glass was used to press the plant flat against the paper, and the arrangement documentation including orientation (front-side vs back-side contact with paper). The hydration state of the plant at time of printing significantly affects the shadow silhouette: a well-hydrated leaf with smooth surfaces pressed flat under glass produces sharp, clean-edged shadows; a wilted or dried leaf with irregular surface contact produces softer-edged, more atmospheric silhouettes. Documenting the state of the plant as a variable equal to the sensitizer concentration allows patrons to predict and reproduce specific aesthetic outcomes rather than attribute all variation to unexplained “process character.”

UV exposure calibration and step wedge protocol

UV exposure calibration is the most location- and season-specific variable in cyanotype work, and it is the documentation that no finished print photograph can carry. UV index varies from 1 in winter overcast to 11–12 at midsummer peak, and the correct exposure time shifts by a factor of five or more across this range. A creator who publishes a print without UV calibration data gives patrons information that is non-transferable to a different location, season, or weather condition.

The step wedge protocol for cyanotype calibration: cut a sensitized paper strip into six sections, expose each section for different durations (1/2, 1, 2, 4, 8, 16 minutes at a standard UV index), process normally, and assess the resulting density progression. The target correctly-exposed section should show maximum Prussian blue density in the deepest shadow zones without losing subtle shadow detail, and retain a clean white in the highlight zones. Record the UV index reading (from a UV meter or a UV index app) at the start of exposure, the time of day, the date, and the cloud cover description alongside each step wedge result. This five-parameter record is the calibration data that allows a patron in a different location to cross-reference their own UV index and derive their correct exposure time from the creator's documented curve.

Toning chemistry and the color shift documentation

Cyanotype toning shifts the blue Prussian blue image toward other hues through chemical reactions at the print surface. Tea and coffee toning is the most accessible: the tannin compounds in tea (gallotannins and ellagitannins) and coffee (chlorogenic acids) react with Prussian blue through ligand exchange and partial bleaching, reducing the surface density of Prussian blue while forming iron-tannate complexes. The color progression visible during toning shifts from the initial Prussian blue toward warm brown or sepia depending on tanning agent type and concentration, with an intermediate stage that passes through green and grey. The toning documentation covers the tannin source (tea species and brew concentration in grams per liter; coffee species and brew ratio), the water temperature (cold water produces a slower, more controlled shift; warm water is faster with more risk of over-toning), the immersion time at the point the creator removed the print (and the color observed at that point), and the photograph of the wet print immediately after removal versus the photograph of the same print after drying (toning color typically shifts and warms further on drying).

Gold toning with gold chloride (HAuCl&sub4;) is a more advanced technique that converts Prussian blue to gold nanoparticles through a redox reaction: Au(III) in the gold chloride is reduced by the surface iron in Prussian blue to Au(0) nanoparticles, producing a color range from blue-black through purple to warm red depending on nanoparticle size and concentration. Gold toning documentation covers the gold chloride concentration in ppm (parts per million), the solution pH, and the immersion time at each visual transition. Gold toning is permanent and non-reversible; it is typically used for archival prints where the gold image is more stable to light fading than Prussian blue.

Apple Tax for cyanotype creator audiences

Cyanotype creators have moderate iOS exposure that varies by platform. Instagram botanical cyanotype photography: 72–82% iOS — botanical prints are highly visual and discovery-driven on Instagram, consumed primarily through mobile. TikTok alternative photography process clips: 65–75% iOS. YouTube cyanotype tutorials: 55–65% iOS. In dollar terms: at $200/month with 70% iOS, approximately $42/month ($504/year) in Apple fees beginning November 1, 2026. At $350/month with 75% iOS, approximately $78.75/month ($945/year). Enable Patreon’s web-only billing toggle before October 31, 2026. Update all social bio links to point directly to the Patreon web URL. Verify the complete subscription flow from an iOS device before November 1.

KeepTier is a self-hosted membership page for creators who want 100% of their tier revenue and zero Apple tax. Plans start at $9/month.