Learn English – “Its color is brown” vs “It is brown in color” describing nouns

I found an interesting grammarian blog on this very topic. Essentially, the post avers that puce is dark purple, but acknowledges the false notion of a "puce green" still persists. (It's theorized that the term might be an adaptation of puke green, but also readily acknowledged that there's no strong evidence to prove that notion.)

Also, I found a dress on Ebay today that was described thusly:

This fabulous Chetta B size 14 cocktail dress is created in a gorgeous deep, rich eggplant purple with a shadow of puce green in a beautiful brocade that is 100% silk.

I suppose that would mean the dress in question is puce-on-puce?

Lastly, I typed "Puce dress" into Google's search engine, and then clicked Shopping; this is what showed up on my screen:

The conspicuously un-puce dress in the middle is being sold as used, so it might disappear from the search query results in a few days. However, it does present some tangible evidence that some people indeed mistakenly refer to pea soup green as puce green.

As for why such misperceptions persist and become widespread, it only takes one exposure to misinformation to lock it into one's brain. This reminds me of a friend who once related how, while working on a project in his garage, he playfully asked his daughter to fetch him a "sawdonkey", making what he assumed was an obviously humorous pun on the word "sawhorse". Problem was, his young daughter didn't know what that object was called, so she simply noted the reference, and tucked it into her brain. Several years later, she was working on a stage crew in college, and it took five or six people to convince her that the object in question was indeed called a sawhorse, not a sawdonkey – she even called her dad that night to verify.

Using via as a preposition in English is of comparatively recent provenance. It has substantially fewer primary senses, and therefore available uses, than does through. The OED gives only two main senses for via as a preposition, which I include here with a few of each one’s later citations:

1. By way of; by the route which passes through or over (a specified place).
   
   
   • 1958 A. Sillitoe Saturday Night & Sunday Morning iv. 60 — Arthur and his father walked via the scullery into the living-room.
   • 1959 M. Gilbert Blood & Judgement xiii. 138 — More··had come to the Police via the Lower Deck of the Royal Navy.
   • 1981 G. Household Summon Bright Water iii. 149 — He led me to talk of my interest in ancient economies and thus, via agriculture in the Forest of Dean, eased the way to my impressions of Broom Lodge.
2. By means of, with the aid of.
   
   
   • 1972 M. Kaye Lively Game of Death (1974) vii. 41 — Any deal··would have to be··concluded via contracts, attorneys, the whole schmeer.
   • 1977 Rep. Comm. Future of Broadcasting iv. 30 — It would in theory be possible to provide five more services with national coverage via satellite.

Here are some examples of through (taken from the OED’s citation list for that preposition) where you could not substitute in via in its stead:

• 1847 Tennyson Princess iv. 554 - Thy voice is heard thro’ rolling drums.
• 1848 Thackeray Van. Fair xxxii, — George··was lying··dead, with a bullet through his heart.
• 1852 R. S. Surtees Sponge’s Sp. Tour (1893) 85 — He was small and wiry, with legs that a pig could run through.
• 1886 Ad. Sergeant No Saint I. vi. 105 — An old land surveyor··put him through a long catechism.
• 1896 T. F. Tout Edw. I, iv. 80 — All through his reign, the Lusignans helped him in Gascony.
• 1903 Times 14 Mar. 14/5 — The Oxonians showed good form through choppy water.
• 1975 Nature 10 Apr. 501/2 — Nine recognised glaze types, ranging in colour from pale blue, through green, to yellow, brown and red.
• 1981 L. Deighton XPD xliii. 342 - A··notice stating that deliveries were only accepted between eight and eleven Monday through Friday.
• Mod. — There is a path through the wood.
• Mod. — It has passed through many hands since then.

In contrast, in these examples from the same source, one perhaps might be able to make that swap:

• 1852 Dickens Bleak Ho. viii, — Mrs. Pardiggle··had been regarding him through her spectacles.
• 1885 Act 48 & 49 Vict. c. 53 §15 — Every notice··sent through the post in a prepaid registered letter.
• 1894 J. J. Fowler Adamnan Introd. 56 — The southern Picts··embraced the truth through the preaching of St. Ninian.

So even though though there are a few places where you can use via or through — or else via and by — interchangeably as prepositions, there are many others where you cannot.

Finally, it should be noted that there are substantive, adjectival, and adverbial uses of both words, and that these non-prepositional uses are never interchangeable.