Posts Tagged ‘broken run’

Different Runs

February 8, 2019


Look at the center of the photo. See that slight color difference between the strip on the left and the strip on the right? This is most likely due to the two strips coming from two different run numbers. These can also be called batch numbers or dye lots.

This means that all paper that is printed from one batch of ink is given a run number. Three months later, when the manufacturer is ready to print another lot of wallpaper, a new pot of ink is mixed up. Chances are that that new kettle of ink won’t be exactly-dactly the very same shade as what was used previously.

This means that the two batches of wallpaper will be ever so slightly different in color. If strips of paper from the two different runs are put on the wall next to each other, you will notice the color difference. So each batch of ink, and the paper that is printed with it, is given a run number.

That way, the installer can be sure that all the wallpaper for his job will be printed at the same time, of the same run number, and all the same shade.

Checking for run number is the first thing every installer should do, before starting to hang wallpaper. In fact, in my “how to prepare for install day” info pack, I ask my clients to check to be sure all bolts are of the same run number. That way, if there is a problem, there will be time to return the bolts and get new paper that is all of the same dye lot.

If you end up with a broken run (two or more different run numbers), it is possible to use the paper, but you have to keep the different runs on separate walls… your eye will not notice a subtle color difference if the papers are on different walls. But this uses up a lot more paper.

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Runs and Dye Lots … Have Me Measure FIRST!

April 23, 2014

I recently did a bid where the homeowners already had their paper. The problem was, they had grossly underestimated how much paper they needed. They had a total of 5 single rolls, but the job actually called for something like 26.

This is a special problem with their selections. They had chosen some quite pretty custom made, very high end papers, made to order out of state.

The problems are many and are serious. Besides having to order quite a bit more of the very expensive paper, chances are the new paper will not match what they already have, so they will have to throw away that paper and buy even more.

When paper is made, there is a “batch,” “dye lot,” or “run” number, meaning all the paper printed at that time came out of the same “batch” of ink. It’s important to use paper all from the same run. Papers printed at a different time from a different run will have a very slight color variation, because the dyes and inks were mixed at a different time.

Will this matter? You bet! If you have to use a “broken run,” it’s best to keep different runs on seperate walls. You don’t notice a slight difference in color so much, because light hits one wall differently from how it hits another wall.

The bad part about this is that if you have to split a strip of paper, as you often do, you can’t use half of the strip on one wall and then on the second wall, and then start with a new run, because the color difference WILL show when strips are next to one another on a flat wall. You can never put different numbered runs next to one another on the same wall – the difference shows as clearly as if you used strips of totally different colors. This means you end up having to buy even more paper, to allow for the difference in dye lots.

Four Bolts, Three Runs

December 5, 2012

Digital Image Here we have Runs AAA, CCC, and ZZZ. What’s wrong with that?

Run numbers, or dye lots, refer to when the wallpaper was printed. All paper that was printed at the same time will have the same run, batch, or dye lot number. Because there can be slight variations in color the next time they mix up a caldron of ink, the manufacturer marks each batch with a number.

Because of the slight variations in color, it’s important to use all the same run number on a wallpaper job. The exception is when you can “break” a run, at a corner, for instance. You can use different runs on different walls, because light hits each wall differently, and your eye expects to see a difference in color. But you can NEVER put two different runs next to each other on the same wall – you are sure to see the color difference along the entire length of the strips.

You can use broken runs in certain instances, but it requires a lot more paper.