Viscous/Rayon

One of our moderators posts lots of highly valuable information on natural fibers.  Due to her posts I  bought my first linen shirt a few years ago and am now absolutely hooked.  I don't mind a little ironing at the beginning of the day and  believe that by the end of the day the newaccumulated wrinkles don't add up to a slovenly appearance.  I have slowly been expanding my collection of linen.  

This year nearly every item of linen I see is blended with viscose.  "Semi-synthetic" cellulose material.   Obviously there's a strong effort here to green wash old fashioned Rayon and so I am curious how much scrubbing is that actually taking.   It seems like it might actually be biodegradable (silverfish will eat this fabric) and it's far behind cotton in the amount of waste fibers they are identifying in the ocean.  The heavy environmental impact seems to be in the manufacturing which is also the case in most non organic natural fibers.  The most common current method is less toxic than the past, but it is clear they have a better option that they usually don't use.  I don't know anything at all about the more expensive but rare manufacturing process.

Does anyone know enough about this to clarify things?  First of all being are clothes that have viscose blended with natural fibers actually biodegradable?  And where should I be looking to find real information about the environmental manufacturing costs?  If the answer to the first question is no the second just becomes a matter of curiosity.   If it's yes, I am not opposed to technology that produces less eternal plastic waste so long as it's not just replacing one kind of toxic gick with another.   Glass and cast iron for instance have manufacturing costs that I feel are justified by their versatility and usable life as well as the endless potential for recycling.

I think I  found my own answers.
It's probably as biodegradable as any non-organic natural material.  There's no telling what dyes and other chemicals are used to change the basic fabric into clothing but the fabric itself isn't toxic.

https://ecocult.com/rayon-viscose-modal-lyocell-tencel-biodegradable-compostable-microfiber/


The manufacturing on the other hand involves highly toxic chemicals that historically (think within the last five years when they looked) have been allowed to spread throughout the waterways surrounding the manufacturing facilities and have caused serious injuries to the workers handling it.

Forests have been cleared to provide raw materials and to plant monoculture to grow more raw materials. The issues of that alone are so many that I am not getting into it here.  Most of us already have an idea.

That's not inevitable, there is growing work both in finding sustainable and renewable sources for raw materials and moving the industry standard manufacturing processes to closed loop systems with less toxic chemicals which protects both the fabric workers and the environment. With careful research and shopping there are times I would be comfortable purchasing something new using some of the related fibers, maybe even feeling like I am helping companies move in a better direction. Those woould be rare circumstances and need much more information than just the word viscose or rayon on the tag.
Second hand I will treat it like a a natural but non-organic fiber.

https://ecocult.com/greenwashing-alert-that-natural-fabric-made-from-plants-might-be-toxic/

If this is an unreliable source or you have more information please feel free to share it with me.

R. Ranson... sorry I would have given them credit in the first post if I wasn't blanking on the name.  If you have any interest in textiles you should probably be following their posts.

Edited to add

If you have no interest in textiles you should probably be warned there are laws about that kind of thing.