Posts Tagged ‘batch’

Two Runs – Bad News

December 4, 2022
Always check the Run number before starting your project. Also called Batch or Dye Lot. Wallpaper that is printed at the same time will marked with a Run number. The next time the factory mixes up a pot of ink and prints wallpaper, it’s likely that there will be a slight shade difference between the two batches. If strips from these two different runs are placed next to each other on the wall, you will see a slight striped effect, a difference in color or depth between the two strips. It may be minor, but it’s noticeable and unpleasant.
You can use two different runs in the same room – but not on the same wall. You can “break” the run in a corner, and use one run on one wall and the other run on the other wall. You won’t notice the color difference this way. But it does eat up additional paper.
To avoid ending up with two different runs, first of all, always buy from a reputable company dedicated to selling wallpaper – not an outfit that also sells boots, hubcaps, cold medicine, and whatnot. Second, check the Run number as soon as you receive your material. That way you’ll have time to return it or otherwise resolve the issue, before install day.

Different Rolls = Different Pattern Match

November 17, 2022
It’s important that all your wallpaper rolls have the same run number , also called batch or dye lot . This means that they were printed at the same time with the same ink . Paper printed later with another batch of ink may be every so slightly different in color / shade . Looks bad on the wall.
The same thing can happen with trimming at the factory. Different runs can be trimmed differently from each other.
With this paper that I hung in a dining room last week (see previous post), the labels on all the rolls / bolts listed the same run number . But there was one bolt that was wrapped in not one, but two plastic wrappers. This raised an alarm in my head, because this indicates that it may have been a roll sent back to the factory, for whatever reason, and then repackaged. When this happens, you cannot be absolutely sure that the run number is actually that which is printed on the label. Somebody at the factory could have just grabbed a handy label and stuck it inside the wrapper.
I tried not to use this double-wrapped bolt of wallpaper. But on the last section of wall, I got to a point where I just needed to use it, for just two 6′ strips. I was pleased that the color of both the background and the motifs matched perfectly.
But not happy with this pattern mis-match.
It was easy to see that the factory trimmers had been placed about 1/8″ to one side, from where they had been placed when trimming the previous rolls.
It’s a busy pattern, and, from a distance, this undercut wasn’t all that noticeable.
But on the other side, there was repetition of the motif , and this will really catch your eye.
Happily, this only affected one seam, and since it was a very busy pattern, from just a few feet away you couldn’t notice it. Still, it bothered me.
So I pulled this strip on the left off the wall, laid it on my table, and used my straightedge and razor blade to trim off that repetitive leaf tip – about 1/8″ from the right edge of the strip.
The second strip, since it came off the same roll and had been trimmed the same, matched perfectly . This was also my last strip, so no more drama with mis-matched designs at the seams .
What the overall pattern looks like.
The pattern is by Rifle Paper , which has been finding its way into a lot of homes lately. This brand is usually a good quality non-woven material , and can be hung by pasting the paper or by paste the wall . It is designed to strip off the wall easily and in one piece, and with minimal damage to the wall , when you’re ready to redecorate . Very cute , cheerful patterns , and good price-point .
Note that the run number is printed on the label.
installer houston

Printing Error – Some Thick, Some Thin

September 20, 2022
See the difference between the motifs on these two different strips of wallpaper ?
The ones on the top are crisper and more distinct , with more space between the black lines. The motifs on the bottom have heavier black lines and appear a bit smudged .
Not a huge difference , but on the wall , especially from a distance , your eye would catch this.
Interestingly enough, all these rolls were from the same batch / run number (all printed at the same time with the same ink and printing press ). In fact, one roll started out “normal” and progressively got darker .
It probably would have looked OK to use this darker paper, especially since this was a powder room and you couldn’t step back far enough to see a number of strips next to each other.
But we had enough wallpaper that I could put these aside and use fresh strips with crisp ink to finish the room.
A good reason to always buy a little extra wallpaper !
The pattern is Les Touches and is by Brunschwig & Fils .

Two Runs – Not Good

May 17, 2022

The homeowner accidentally ordered half as much wallpaper as was needed, so more was ordered. Unfortunately, we were not able to get the same run number (also called batch number or dye lot ).

Wallpaper bolts printed at the same time will all have the same run number. Then the next time the manufacture prints this material, he’ll mix up a new batch of ink. This new ink will almost assuredly be a teeny slight difference in shade .

You can’t put wallpaper strips from different runs next to each other on the same wall; you will see this slight color difference and the wall will have a subtle yet unpleasing striped effect.

You can, however, use different runs on different walls, “breaking” the run in a corner. You won’t notice the color difference because light hits different walls differently and causes a natural color difference.

This trick works, but it does require extra wallpaper.

Moral of the story:

~Always confirm how much paper is needed with the installer before ordering.

~Always buy a more than you think you’ll need; one extra double roll / bolt at minimum.

Run Numbers Matter – More

April 19, 2022
When you hang wallpaper, you need to make sure that all the rolls / bolts are from the same Run Number / Batch Number / Dye Lot. This means that the rolls were printed at the same time from the same batch of ink.
Another batch of ink that’s mixed up and then printed a few weeks later may be a very slightly different shade. You can easily see that color difference in this photo.
Placing strips from two different runs next to each other on the same wall will result in a subtle but unpleasant striped effect.
Besides the color differences of the ink, the printing press can be positioned differently, too.
Look at the bottom strip, at the left of the photo. The vertical line on the left is wide.
But now look at the strip on the right, which is on top. It’s from a different Run.
Here the vertical strips is narrow.
If strips of wallpaper from these two different runs were placed next to each other on a wall, not only would you see a color difference between them, but you would have an unpleasant striped effect, because one vertical stripe element in the design would be unnaturally wide, and another would be much narrower. In between would be other stripes that are the standard medium width.
Very un-uniform and very un-pleasing.
Before any wallpaper rolls get cut, pasted, and stuck to the wall, check to be sure the run numbers are all the same!

Mud Room Gets More of the Navy Blue Roses

March 18, 2022
Continuation from yesterday’s post … the adjoining mud room got the same wallpaper pattern.
This room was done with a different run / batch number from yesterday, and the pattern match was better at the seams. See yesterday’s photo.
There were, however, some very faint lines running through some of the material. I’ve had this same thing happen recently with other York papers. Very disappointing. Today’s lines were pretty faint, and I went ahead and hung the paper.
This paper is by Caitlin Wilson and is in the Sure Strip line by York . It’s a pre-pasted material and very nice … one of my favorite brands.

Replacement Paper a Different Run ??

June 22, 2021
Ink smudge. One of many printing defects throughout all the rolls of wallpaper
Replacement paper came in the same run number as defective paper. Not good.
Despite the label, the replacement paper (on the right) must surely be a different run. Note the pattern mis-match, as well as color discrepancy between the two strips. The motifs on the left are lighter and yellower than those on the right.

When I originally set out to hang this Anderson Prints wallpaper in a northwest Houston powder room, there were too many printing defects to be acceptable. The homeowner had the store send it back, and we requested that the replacement paper be from a different run (printed at a different time and with a different batch of ink), to ensure that the new paper would be defect-free.

The replacement paper arrived with the label stating the same run number – Run 2. But I have to question that. I think they stuck the wrong labels on the new rolls.

For one thing, notice the pattern mis-match, between the original rolls (left) and the new paper (right). This indicates that the trimming rollers were set at different points in the design – and that can only happen when the presses are set up to print off a new batch / run of wallpaper. (I’m tossing in an educated guess on that one … Another scenario could be that the trimming wheels got wobbly and rolled out of “true.”)

Either way, these two bolts of paper were not printed and trimmed at the same time.

You will also notice a pretty obvious color difference between the original paper (left) and the replacement (right).

Again, it’s pretty certain that these rolls were not printed at the same time from the same batch of ink.

Run Numbers – Re Previous Post

May 15, 2021
Run numbers are important!

Re my previous post, before I visited, the homeowner had purchased 8 rolls (4 double roll bolts) of paper. This was just exactly enough (12 strips) for the headboard wall, but I told him to order 16 more to do the rest of the room. The new paper came in a different run. So we had Run 16 for the headboard accent wall, and Run 17 for the other walls.

(You can’t mix runs on the same wall, because different runs, printed at different times with different batches of ink, will be slightly different shades. This very slight color difference will show up on the wall as a striped or “paneled” effect.)

The wallpaper is by York. It is a non-woven material, comprised of synthetic fibers rather than wood and cotton. The synthetic material does not expand when wet with paste, which means the wallpaper can be hung via the paste-the-wall method, with no “booking” or “soaking” wait time needed.

Interestingly enough, Run 16 behaved differently from Run 17. I hung the accent wall with Run 16 quite successfully using the paste-the-wall method.

But when I started the next wall using Run 17, bubbles and wrinkles developed. The paper was absorbing moisture from the paste and expanding on the wall, creating the small bubbles. Quite unexpected with a non-woven material.

The solution was to paste the back of the wallpaper, rather than the wall. This allows the material to absorb moisture and expand a tad before you get it to the wall, so it will behave itself once it is on that wall.

Unlike a traditional paper, this non-woven material did not need a lot of time to absorb moisture, but could be pasted and hung immediately. This greatly speeds up the installation process.

Pasting the paper has an additional advantage in that it renders the material more supple and pliable, which makes it much easier to work around corners or manipulate into position in tricky areas.

Step 1 – Checking Run Numbers

March 28, 2020


Before you start any wallpaper project, it is important to check the Run Numbers (Batch Numbers / Dye Lot).

This means that all the bolts / rolls have been printed at the same time, and are of the same shade.

Bolts printed at different times (different Run Numbers) will be of a very slightly different shade.

They canNOT be placed next to each other on the same wall, because you will notice a subtle-but-disagreeable difference in color between the strips of paper.

So make sure that all your bolts of paper are from the same Run Number.

Note that many on-line vendors are clueless about run numbers, so this is an important thing to check, if you buy low-priced papers on-line.

All the Same Run, Please

February 7, 2020


This homeowner measured her walls and ordered paper before I came by for a consultation. As often happens, she ordered too little paper.

When the additional bolts arrived, unfortunately, they were a different run.

Run number refers to all the bolts that were printed from the same batch or dye lot of ink. The next time the manufacturer prints a run of this wallpaper pattern, the inks will be ever so sightly a different shade.

You cannot place strips of wallpaper from different runs next to one another on the same wall, because you will see the color differences for the entire length of each strip.

You can, however, use different runs on different walls, because your eye won’t notice if the run is “broken” in a corner. This method does require the use of additional paper, though, in order to match the pattern.

In this case, we had enough extra paper. I was able to keep one run on the west and south walls, and then use the other run on the north and east walls.