Hi Eric,
I have the linen edition on my workbench too, could not resist.
On Sergey's behalf please let me answer your questions: all of these four paints come from the new product line of Drooling Bulldog, tailor made paints. To be more specific, Sergey is now able to mix paints on customers' demand. This linen edition was tailor made for one customer building the WNW Albatros B.II - bleached linen, unbleached linen and pale cream yellow (colours "I", "M" and "U" in the WNW construction manual). Cream yellow is suitable especially for allied aircraft, as it represents linen with thick coat of varnish. All in all, the paints are universal and their use is difficult to assign to a specific type of aircraft, photos of original kite will be the best guideline.
Two remarks from my experience: bleached linen and unbleached linen are great for weathering (strongly thinned ideal for airbrush applied filters etc.), pale cream yellow is great for lightening warm colours to scale (e. g. kraplak).
Hope this helps, in case of any further details needed, please let me know any time, will be happy to help.
Cheers.
Ondra