What Is a Dye Lot? How to Read, Match and Mix Yarn Dye Lots
You finish the body of a sweater, join a new skein for the sleeves, and the color shifts. It is one of the most common heartbreaks in knitting and crochet, and it almost always comes down to dye lots. Here is what a dye lot is, how to find it on a yarn label, how to avoid problems before you start, and how to rescue a project when your lots do not match.
The short answer
A dye lot is a batch of yarn that was dyed together, in the same dye bath at the same time. Every skein from that batch carries the same lot number on its label. Skeins of the same color from different lots can look slightly different, so for any single-color project, buy all of your yarn from one lot, plus one extra skein.
What is a dye lot?
Dyeing yarn is a lot like baking. You can follow the same recipe twice and still get two slightly different loaves. Water chemistry and temperature, time in the dye bath, how the dye goes in, even the humidity on dyeing day all nudge the final color. So does the wool itself, since fiber from different flocks and seasons takes dye a little differently.
Within one batch, those conditions are shared, so the skeins match. Between batches, they drift. The color name and number on a label tell you the shade. The lot number tells you which batch it came from.
What does dye lot mean on a yarn label?
It identifies the batch the skein was dyed in. If two skeins share a color number and a lot number, they came out of the same dye bath and should match. If the color number matches but the lot number does not, they are the same shade on paper but may look different side by side.
Where do I find the dye lot number on yarn?
On the ball band or label, usually right next to the color number. Look for Lot, Dye lot or Lot no. European yarns often use their own words: Partie in German, bain in French, bagno in Italian and lote in Spanish. Hand-dyed yarns may have a batch code written by hand, or no lot number at all. Keep at least one label until your project is finished.
What is no dye lot yarn?
Some mass-produced yarns, mostly acrylics, are dyed to such a tight standard that the maker labels them no dye lot. It means the manufacturer considers every batch close enough to mix. It is not a guarantee, so it is still worth comparing skeins in daylight before you start.
When dye lots matter
Does dye lot matter?
It depends on the project.
- It matters most for large, single-color projects like sweaters, blankets and shawls, especially in solid light and medium shades, where a shift between lots is easy to see.
- It matters less for one-skein projects like hats and socks, for stripes and multicolor work, and for scrappy blankets where every row is a different yarn anyway.
Do hand-dyed yarns have dye lots?
Yes, and they vary even more. Hand-dyed and kettle-dyed yarns are made in small batches, and the dye takes unevenly by design, so skeins can differ even within the same batch. For any hand-dyed project larger than one skein, alternate skeins from the start. Browse our hand-dyed yarn and the kettle-dyed colors from Malabrigo.
How to avoid dye lot problems
- Buy the whole project at once. Use the yardage on your pattern, then add one extra skein. Lots sell out, sometimes within days for small-batch yarns, so do not count on coming back later. Our guide to how much yarn or roving you need walks through the math.
- Check every label. Skeins on the same shelf are not always from the same lot.
- Compare skeins in daylight. Two lots can look identical under shop lights or on a screen and obviously different in a window.
- Check before you wind. Unwound skeins of regular-priced yarn can be returned within 30 days of delivery. Wound skeins cannot, so line up your skeins first. Details are on our returns page.
- Keep a label and a snippet of yarn with your project notes, so you can match it later.
When we pack yarn orders, we check that the dye lots match. If we cannot send your order from a single lot, we call you before it ships so you can decide what to do.
What to do when your dye lots do not match
How do I blend two dye lots?
Alternate them. When knitting flat, work two rows with one lot and two rows with the other, carrying the unused yarn loosely up the side edge. In the round, alternate every round, switching at the beginning of the round. In crochet, alternate every row or two the same way. Start alternating well before the first lot runs out, ideally from the beginning, so the change spreads across the whole piece and the transition disappears.
Where can I use a different dye lot so it looks deliberate?
Put the odd lot somewhere it reads as a design choice: ribbing, cuffs, a collar, button bands or a border. Use it for a matching pair, like both sleeves or both cuffs, so any difference looks intentional. Or turn it into stripes.
Can I dye two lots to match?
Often, yes. Overdye all of the skeins together in one dye bath, usually in a slightly darker shade, and the result becomes a new single lot. It works best with lighter colors, and you need a dye made for your fiber, such as acid dye for wool and other animal fibers. Test a small length first. Our dyes collection has what you need, and superwash yarns take dye especially quickly (see our guide to superwash wool).
Can I buy more yarn from the same dye lot?
Sometimes. Lots sell out, but it is always worth asking. If you bought the yarn from us, call (509) 536-7746 with the yarn name, color number and lot number, and we will check what we have. If we are out, knitting friends, your local guild and online destash groups are good places to look.
Can I return yarn if the dye lots do not match?
Unwound skeins of regular-priced yarn can come back within 30 days of delivery, so check your lots before you wind anything. Wound skeins cannot be returned, and sale or discounted yarn is final sale. The full details are on our returns page.
Dye lots in spinning fiber
Does dyed spinning fiber have dye lots too?
Yes. Commercially dyed roving and top come in batches just like yarn, and hand-dyed fiber can vary from one bump to the next. If you are spinning enough for a sweater, buy all of the fiber at once, then mix it as you spin: split each bump into strips and draw from different bumps in turn, so any differences spread evenly through the yarn.
The bottom line
Dye lots are a small detail with a big effect. Check the number on every label, buy all of your yarn at once with a skein to spare, and alternate skeins whenever you are not sure. If a lot does slip through, you have options: blend it, use it on purpose, or dye it to match.
Questions about a specific yarn or lot? Call us at (509) 536-7746 or email sales@paradisefibers.com.
More answers on yarn care, from washing handspun to choosing between superwash and non-superwash wool, are in our FAQ.