Platinum/Palladium Print

Platinum/Palladium Print is the premium alt-process in B&W photography — uses platinum and/or palladium salts as the image-forming metal (instead of silver) for prints with exceptional tonal range, archival permanence measured in centuries, and a distinctive matte surface character that gallery and museum collectors specifically seek. Platinum/palladium prints are the most expensive alt-process to produce due to platinum group metal costs ($30-50 per gram of platinum chloride) but produce results no silver-gelatin process can match.

Key features

• Platinum + palladium chloride salts as image metals (typically blended; pure platinum is most archival, pure palladium is warmer-toned, blends are most common)
• Iron sensitizer: ammonium ferric oxalate (Ware's reformulation) or ferric oxalate (traditional)
• Single-coating UV-exposure workflow like cyanotype
• Exceptional permanence: 1000+ year archival expectation
• Distinctive matte surface — image lies in the paper, not on a coated emulsion layer
• Continuous tonal scale — finer mid-tone gradation than silver-gelatin

Workflow

1. Mix sensitizer: blend of platinum chloride + palladium chloride + ferric oxalate (or ammonium ferric oxalate)
2. Coat paper in subdued light; dry under controlled humidity
3. Expose under UV through digital negative or contact print (10-45 min typical)
4. Develop in potassium oxalate solution (image emerges in seconds)
5. Clear in dilute hydrochloric acid (3 changes, 5 min each)
6. Final wash 30+ min

Practical notes

• Most expensive alt-process — calculate per-print cost (typically $5-20 per 8x10) before committing
• Use only premium papers — Arches Platine, Bergger COT 320, Hahnemühle Platinum
• Humidity control matters — coating humidity affects tonal range; drying humidity affects exposure latitude
• Pure platinum is most archival but more expensive; pure palladium is warmer-toned and cheaper; blends are most common
• Compatible with digital negatives designed for the platinum tonal curve
• PPE: nitrile gloves; platinum and palladium salts are toxic; oxalate salts are toxic
• Best learned in a workshop setting before independent practice

Related recipes

• [[recipe-new-cyanotype-ware|New Cyanotype (Ware)]] — accessible UV-exposure alt-process for learning the workflow
• [[recipe-van-dyke-brown|Van Dyke Brown]] — affordable alternative warm-tone alt-process
• [[recipe-classic-cyanotype|Classic Cyanotype]] — simplest UV-exposure alt-process
• [[recipe-gold-toner-gp-1|Gold Toner (GP-1)]] — alternative archival treatment for silver-gelatin prints
• [[recipe-krst|Kodak Rapid Selenium Toner]] — silver-gelatin archival alternative