Lumen photogram created with bladder chain kelp (Stephanocystis osmundacea) collected by the artist while freediving off Descanso Beach, Catalina Island on April 13, 2025. Part of the ongoing Blue Forest work.

Unique silver gelatin print (1 of 1). 11 in x 14 in. Custom framed with museum glass, signed with artist notes on verso. Ships with a certificate of authenticity.

Local pickup available for Orange County and San Diego.

Lumen photogram created with feather boa kelp (Egregia menziesii) collected from Descanso Beach, Catalina Island on April 15, 2025. Part of the ongoing Blue Forest work.

Unique silver gelatin print (1 of 1). 11 in x 14 in. Custom framed with museum glass, signed with artist notes on verso. Ships with a certificate of authenticity.

Local pickup available for Orange County and San Diego.

Cyanotype photogram created with Dictyota spp, collected by the artist while freediving off Descanso Beach, Catalina Island, California on May 13, 2024.

Unique diptych cyanotype on paper (1 of 1). 18 x 24 in. Two panels each 18 x 12 inches, exposed simultaneously. Custom float framed in light maple gallery frame with Artglass glazing, exterior dimensions 22 x 28 in.

Signed with artist notes on verso.. Ships with certificate of authenticity. Local pickup available for collectors in San Diego and Orange County.

Van dyke brown photogram created with giant kelp (Macrocystis pyrifera) collected by the artist while freediving off Descanso Beach, Catalina Island on May 2, 2024.

Unique van dyke brown on paper (1 of 1). Paper size 22 in x 30 in. Custom float framed with museum glass. Signed with artist notes on verso.

Local pickup available for San Diego and Orange County.

Van dyke brown photogram created with Wireweed (Sargassum muticum) collected by the artist while freediving off Descanso Beach, Catalina Island on May 2, 2024.

Unique van dyke brown on paper (1 of 1). Paper size 22 in x 30 in. Custom float framed with museum glass. Signed with artist notes on verso.

Local pickup available for San Diego and Orange County.

Original cyanotype on raw canvas. Exposure made with elkhorn kelp (Pelagophycus porra) collected by the artist while freediving on November 1, 2023.

Raw canvas with dowel pockets, aluminum hanging rods. Size 82 x 54 inches. Signed.

Greeting cards printed with reproductions of original alternative process prints, all images created on Catalina Island.

This is a set of 5 cards that will include one copy of each variant. Each card comes with an envelope, and they are blank inside for your thoughts & feelings.

A7 size (5 x 7”) cards.

Small Group Cyanotype Workshop

Sunday, September 13, 2026; 12 - 3 pm

Location: The Sea House, 246 N Coast Hwy 101, Encinitas, CA

All ages are welcome. Children below the age of 16 must be accompanied by a ticketed parent or guardian.

Workshop Description:

Join Oriana Poindexter and SeaTrees for an interactive cyanotype workshop. Learn this early alternative photographic process and use organic materials to create your own cyanotype prints using photo chemistry techniques first developed in the 1840s.

The resulting prints are records of the state of the ocean and your creative process on that particular day, recorded in the blue and white palette of the sea itself. Cyanotype is an alternative photographic process used to create photographic prints in the distinctive shade of Prussian blue and white without the use of a camera, exposed with the sun and developed in water.

This workshop will teach you the fundamentals of the cyanotype process, its history, and will culminate with each participant creating at least three original cyanotype prints - usually something frame worthy.

The first portion of the workshop will involve an introduction, demonstration and selection of materials. The second portion will be a printing session. If you have materials you’d like to bring to use for printing (sentimental objects, dried botanicals, etc), please feel free to bring them.

The cyanotype workshop with Oriana was the best 2 hours I’ve spent in a long time... Oriana is a knowledgeable, enthusiastic and inspiring leader. The workshop was worth the price. I’m ready for another experience.

- Cyanotype Workshop Participant, June 4, 2022

Registration fee includes all materials and instruction, as well as light refreshments and seaweed snacks. Once registration is complete your spot is reserved and you’ll begin receiving event reminders. A portion of your ticket price will be donated to support SeaTrees.

Workshop registration is non-refundable. For details, please read our policy here.