Steel variation
 

Here is a pattern on a Parker that seems to have two different types of steel, and colors differently when refinished. I’ve seen this on other barrels, but this on was really pronounced
My theory (and I would love to hear others) is that the riband was composed of three different billet metals:
1 a high carbon steel that reacts with oxidation and logwood to color black
2 a low carbon steel that doesn’t react as strongly and colors grey
2 very low carbon and corrosion resistant wrought iron that colors white.

If this sort of thing fascinates me, does that make me eccentric?

There existed many variations in iron composition both in terms of content and carbon depending on the ore and or smelting process. I think your guess is a good one. There was also carburized iron which was variously referred to as shear steel or blister steel. The iron would spark but would still pickle to show grain structure. I made some iron/blister steel damascus but couldnt get good contrast. At the time, I thought it because i was doing something wrong but later decided it was that the two materials had very similar (too similar) composition. You also could have a situation where a bar was over worked and you had carbon migration for steel to iron which would effectively make blister steel as part of the welding process.

Thanks for alerting me to this thread Bruce.
I'm working on enhancing the images and figuring out the scrolls (Steve Culver hates that description but Dr. Gaddy used it so I'm in good company ;) ), the rod to rod 'zipper' welds, and the straighter ribband edge welds.

I'm afraid there was no descriptive name for that pattern other than 'it's a bit of a mess' :)
The twisting of the rods after they were machine rolled & welded determines the size and symmetry of the scrolls, and the hammer welding of the twisted rods and then the ribband edges also contributes to the appearance and symmetry of the scrolls. I'm afraid the fella was having a bad day.
The be fair to Parker Bros. the 'rough forged tubes' were paired at the tube maker's, then wired together and shipped about 50 in a barrel. And the pattern is very difficult to discern rough forged.

I am of the opinion, but could be wrong, that the rough forged tubes Parker used for Lifters were primarily sourced in England based on a few examples still with Birmingham provisional proof marks, and top lever guns had tubes almost exclusively from Belgium, which IMHO were aesthetically more pleasing, but not stronger.
https://docs.google.com/document/d/1...YvzD18i3c/edit

More than anyone probably wants to know here about the iron and steel used for pattern welded barrels, and as Aaron said there was a great deal of variation; over time, the iron, charcoal or coke sources, and the forging technique
https://docs.google.com/document/d/1...m8-_AQPiA/edit

IN GENERAL the iron was wrought iron and the steel low carbon.

IN GENERAL with coloring the iron remained silver/white and the steel blue/black, but that is complicated also. Lots of information here, with helpful comments by Steve Culver
https://docs.google.com/document/d/1...g51u_SnEM/edit

I'll be back, hopefully with some visual aids :)

Parker Barrels:
 

To add context, the subject barrel set is from my #3 Frame 1880 Parker $85 Grade 10 gauge Lifter, 30” barrels and about 10-1/2 pounds.
Breck reported the following:
“MWT= 44 thousandths 6” from right muzzle. Vast majority of the tubes are over 50 thousandths. Plenty thick.”
When I saw the photos I remarked to Breck that the barrel craftsman needed to check himself into rehab and the Parker workman needed glasses when he matched the barrels.
Thank you Dr Drew for your assistance.

"two apprentice crolle"

This is one segment.

I think the red marks at the bottom indicate the ribband edge welds, and the blue the 3 'scrolls' between the squished scrolls at the ribband edges which were 'jumped' or edge to edge butt welded - so it would be a 4 Iron crolle.

The 'smudged' areas within the white indicate IMHO decarburization - excessive heating of the metal causing loss of carbon and therefore lack of contrast with staining

https://photos.smugmug.com/Damascus/...rization-L.jpg

The white arrows indicate decarburization lines. Another example - Parker 6 Iron "Turkish"

https://photos.smugmug.com/Damascus/...tion%202-M.jpg

A much more aesthetically pleasing segment with more symmetric scrolls.
The red marks indicate the ribband edge welds - note how straight the weld at the red arrow is.

I think the white is a decarburization line

https://photos.smugmug.com/Damascus/...tion%203-L.jpg

Clearly one of the steel alternees stained much more darkly and one can only assume a much higher carbon strip of steel was 'stacked' into 'lopin'.
Hard to count but I think the 'lopin' had 6 steel and 6 iron alternees.

This is a mess. Mismatched tube segments again with decarburization.
The big 'stars' I think were related to 'inexpert' twisting of the rods

https://photos.smugmug.com/Damascus/...%281%29-XL.jpg

[QUOTE=Drew Hause;387611]This is a mess. Mismatched tube segments again with decarburization.
The big 'stars' I think were related to 'inexpert' twisting of the rods

The “big stars” are what I normally see in Crolle patterns. An aestheticly pleasing pattern in my opinion.

This is what Parker 4 Iron "Turkish Star" is suppose to look like :)
Symmetric and alternating black (steel) and white (iron) stars between the scrolls

https://photos.smugmug.com/Damascus/...rTurkish-L.jpg