WASHI X is a 135 colour film, 36 exposures, ISO 100/21°. It is a technical film, and the two things to know about it are that it carries no orange mask and that it can be processed in two different ways.
Two processes to choose from
You can hand the same roll to C-41 and get a colour negative, or hand it to E-6 and get a colour positive — a slide. That is a rare property: a film normally does one or the other. You make the decision after shooting, before processing.
Why there is no orange mask
The mask is a technological layer in an ordinary colour negative that corrects colour at the printing stage. There is none here, and that is exactly why the maker describes the result as warm and highly saturated, recalling the first colour negative films of the 1940s and 1950s. And if you want a slide out of the film, the absence of a mask is what makes it possible.
What to shoot on it
ISO 100 is a daylight speed. I would pick this film for a specific idea: when you want that recognisable vintage colour palette, or when you deliberately want to shoot a 35 mm slide without reaching for Ektachrome.
Processing
Any lab will do the C-41. E-6 is far less widely available — arrange it before you shoot the roll, not after.
