dyeing linen

[caiusbeerquitius]

On what information in ancient sources do you base this presumption ?

I provided one. When I have more time I´ll post more info on that, if you need. For a brief overview of the discussion until 1987 you may want to consult the relevant part in:
Wolfgang KEMP: Sermo corporeus. Die Erzählung der mittelalterlichen Glasfenster, München 1987.
Apart from that Crispus nicely and expertly provided the relevant considerations.

I have had problems with the explanation that Roman statues all should have been copied from Greek statues which we do not have anymore.

Who gave that explanation? That´s outright wrong, and quite a nonsense...

Even though a lot of statues are obvious copies you cannot state that every statue was, let alone that every form of art depicted is hence not suitable for reconstruction.

I did not make this connection: "An ancient copy is not suited for reconstruction", as you imply. You must read more carefully. It doesn´t make sense to attack a position noone took.

Colours have been retraced, as well as frescoes depicting colour use, also, colours were found on textile remains.

That is correct and not in opposition to what I wrote. You must read more carefully,and try to understand what I wrote. It doesn´t make sense to attack a position noone took.

To state with definity that certain reconstructions are wrong, or even impossible, because of some theory which has not been proved at all, like some "scholars" seem to constantly have an urge to point out, even in certain magazines well known to all of us, in my opinion is outright impolite and rude to those who venture to reconstruct what they think something MIGHT have looked like.

Well, it is not about politeness (not to say that politeness is not important), but about methodological correctness. There is a difference between a theory and a hypothesis, btw. If all people would foresake methodological correctness for wrongly understood politeness, we would have no academic discourse at all. ("I found out that the earth resembles a ball and not a disc, but I keep it to myself, people might be offended") What lacks here, is, generally, the ability to make a broad interdisciplinary approach. Hence many thoughts and considerations seem logical within a confined disciplinary space, but in regard of the results of other disciplines either lack information or are not sensible questions at all.

When did science become arrogant and blatantly disregarding the possibility of the impossible?
When did reconstructions needed to be criticized beyond the realms of founded criticism, or what we like to call, without building criticism (opbouwende kritiek).
One should not say, this is wrong, this cannot be, or even this is nonsense, but one should say, It might have been different, did you consider so and so, would you like to retry it using this and that et cetera........

That is semantics you are complaining about, nothing less, nothing more. You mean constructive criticism, right?

I am getting a little fed up with people constantly criticizing others on here for what they in their own time, and with hard effort make, produce and try to reconstruct.

Well, you shouldn´t. Instead you should see all the advantages of scholarly discourse. But all you do, in the end, is whine about the tone:

Of course not all reconstructions are correct, but i would urge all fellow members to remove the beam from their own eyes before blatantly and arrogantly trying to remove a splinter in someone elses eyes.

Did you on purpose write a pathetic pseudo-moral sentence without an argument? That is at least as impolite as you say I would be be. IMO you have lost with your post, # "scholars", #last quoted sentence #other posts of yours in large numbers, any authority to judge about politeness of others. Do you want me to quote from this very forum?
This is double-moral and self-righteous behaviour, which makes your complaint outright ridiculous, at least in my eyes. Just for your records: I will definitely not venture with you any further into this, my time is too precious for me to do so, and I have a hell of a headache. So, you may have the last word on this.