I would soak in Biz POWDER. Change the water after 6 hours adding more Biz as the enzymes will die at 4 hours and the sodium percarbonate at 6 hours. It does look as if its yellowed from storage or improper laundering,

I might try just soaking/washing them together in a sink. The "colour" from the one that is tinted might just transfer to the white one. Nothing ventured, nothing gained, and most importantly, nothing lost. Good luck.

Go Gothic dye both black. Sorry think it time for a nap.

I would try soaking it first in an Oxyclean solution, and changing the solution after 6 hours as mamapinky suggests. I offered to finish a tablecloth in this pattern for my son's friend who found a partially completed tablecloth when he closed his mother's house. Someone online found the pattern for me, which is from about 1945, so that is how long the cloth may have been sitting around. I pulled the motifs apart and reshaped the cloth from a lopsided circle with many damaged motifs to a rectangle for his table. Then I had to finish the cloth by crocheting the motifs that would hang down the sides of the table, and I had to use new, white crochet thread. When I finally reassembled it, I soaked it and washed it to remove the stains on the old parts. I was surprised how much the old motifs lightened from the natural ecru. However, the new sides of the cloth were still whiter, but since I made the center of the cloth, the part that would cover the top of his table, in his mother's motifs, it did not really look mismatched because the sides of the cloth fell into the shadows. His mother's crocheting was very tight, and I had to work hard to make the size of my work to match hers. Your sample on the right seems to have one more row of edging on each motif. If you want to crochet a larger panel, I would be happy to share the pattern with you.

Thanks, all. I'll try the Oxyclean. I didn't know it needed changing after 6 hours. Good to know.

I saw the border was slightly different, but I knew the odds were against my finding anything closer. Over the last couple of years I often found things in this motif, but all were too small to use. I actually bought a few of the smaller ones, thinking I could stitch them together. Or if I found a big one, then use these to tack onto pillow shams or throw pillows.

Thanks for the offer of the pattern. Much as I admire it, crocheting is not for me! I tried enough in high school to know it's harder than it looks to get things even. The doilies I tried back then were hysterically bad. Sewing, I can do....

Oxy clean doesn't need changing after 6 hours....Iw ould soak it for easily 24 hours....then tea dye both.

It won't hurt anything soaking after 6 hours but sodium percarbonate dies at right around 6 hours so the benefits after 6 is nil.

Use something like Snowy Bleach that contains sodium perborate.

Sunlight will bleach linens too - just wash & hang in the sun - sometimes it takes more than 1 time.

I have collected and sold vintage linens for years. I've found Biz to be my always first to go to.

Linda is Snowy still available?

Thing with sodium perborate is it needs temps of above 140F to do its job unless it contains a bleach activator. Many people have issues using hot water

I was thinking...if you choose to tea dye I would still continue whitening the discolored, if indeed it is discolored one otherwise when you tea dye you could still end up with two different colors since your starting with two different colors.

Biz powder not the liquid is highly recommened as a soak for vintage linens.

I can't find snowy, I use the oxygen bleach from the $ store...but have no idea what is in it.
Hydrogen peroxide solutions dissipate after a few hours in the presence of certain organic compounds and enzyme cleaners are among them. Hydrogen peroxide is an oxidizing agent and being in the presence of certain compounds that have a "hook" for that extra oxygen atom to attach to, uses up the oxidation properties....so don't use an enzyme cleaner and an oxygen bleach in the same wash.
I sure have soaked things in oxygen bleach for several days and found the stains diminish over time.
It's important to know what caused the stain to find the best way of removing it....Biz contains an enzyme, best used or organic stains like blood, grass and gravy. Some stains need a solvent to remove them, like tar and grease stains and sometimes ball point pen ink.
Certain stains don't respond well to an oxidizing aren't and need a stain remover that is a reducing agent....meaning that they don't "offer an extra atom of oxygen" but they "need an extra atom" and remove a stain by "taking that extra atom"...oxalic acid and products containing it are common reducing agent stain removers. Rust removers are among reducing agent stain removers.
I worked in the lab at a laundry mfg for a few years.

Linda I see you read like I do..haha

I had a crochet item I left in the car console for a week to my dismay the pink flowers part not the white faded drastically. But yours is too different shades. May not be helpful who knows?

Yeah, I read....but I learned this stuff years before the internet, in a college classroom and the lab of a major appliance manufacturer.

Linda the oxygen bleach from the Dollar Store is probably quite safe as its pretty much mostly sodium carbonate.

I read somewhere on line that it's the same stuff as Oxy clean...but I don't think so as it smells different....and I am fairly certain it's not sodium carbonate.
Certainly never occurred to me that it wouldn't be "safe". It's good for soaking for stain removal, and doesn't "die" after 6 hours, but I am sure some of the available oxygen atoms have connected to something by then.

Oxyclean, the dollar store brands ect...ect...are formulated using two main ingredients....Sodium Carbonate and sodium percarbonate. Sodium percarbonate is oxygen bleach and sodium carbonate is washing soda. Problem with the dollar store brand is its almost all sodium carbonate and very little oxygen bleach. Even the name brand Oxyclean is heavy on the sodium carbonate.

As for dying perhaps that the wrong word....sodium percarbonate aka oxygen bleach becomes inactive after 6 hours of becomming wet.

How is that 6 hours determined.....from what my old brain remembers, sodium percarbonate degrades to hydrogen peroxide which does the bleaching, which then degrades to oxygen and water. and the speed with which those reactions happen is determined by the temperature and the Ph, as well as the presence of certain organic compounds ( the things you want bleached out!) High temperature speeds the degradation and high Ph speeds it up as well as agitation.
So where did the 6 hours come from?

I read about the 6 hours effectiveness on the package several years ago..

Yep and this is why you won't find a single liquid laundry detergent that contains sodium percarbonate. You will find liquid detergent such as ALL with Oxi or Tide with Bleach Alternative but neither one have any sort of oxygen bleach instead they have more surfactants and a enzyme cocktail.

But as for oxygen bleach not hurting colors or darks it sure will, perhaps not right away, but keep using it and it will after all its a bleach. It will not strip color like chlorine bleach but it will fade.

My favorate for vintage whites and lights is Biz powder. It has the oxygen bleach and enzymes to help remove stains. You can also order a more pure oxygen bleach without all the fillers on Amazon, just look up sodium percarbonate. Its cheaper than Oxiclean and is 99% oxygen bleach. Much more cost effective.

I just used Biz powder on a piece I bought on the same day, that has alternate panels of crochet and linen. That had only slight stains. The crochet came out clean but the linen didn't.

Another issue, but...Taking a closer look today, I wonder if it is unbleached and possibly handwoven linen....I was holding the linen squares up to the sun and saw tiny darker specks like it was never bleached, plus denser areas of weaving like the weft was compacted more. The denser areas look darker.

It doesn't look old enough to be actually handwoven linen... unless someone cut up an old piece of weaving to add the crocheted panels.

Hmm....there are a lot of hair coloring products on the market, and in bottles containing hydrogen peroxide.
And lots of dyes, some of which could be considered stains, like the color left from a crayon or lipstick after the paint has been removed, don't respond to a safe solution of clorox....but do to Rit color remover, which is a reducing agent, rather than an oxidizing agent.

Linnea are you sure the unbleached panels are linen and not unbleached muslin?

It really feels like linen. Even un-ironed, it has a certain crispness and weight to it. There are a fair number of slubs and thicker fibers.

The only muslin I've ever used has been that for sewing, and that seems softer, though I don't have any on hand to compare.