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How To Avoid Dye Migration With The Wet-White-Cloth Fabric Test
New owners are given plenty of advice, but this is the single most major piece, and it's the one most regularly ignored. Permanent from the moment it occurs, dye migration is the transfer of colour from dark fabric onto the doll's skin. Absorbed into TPE, a stain simply can't be removed, by any cleaning product, any method or any quantity of scrubbing. The one defence is prevention, and the way to start is an uncomplicated test which takes two minutes and costs nothing.
 
Pale Dolls Show It Worst
The reason this happens is chemistry. The dye gets drawn into oil-based TPE because dark dyes are generally oil-soluble, rather like water soaking into a sponge as it migrates from the fabric. Leave a doll in a dark dress for a few hours in a warm room and that's enough to cause a permanent stain, as the process starts straight away on contact. While pale dolls show it particularly obviously, since dark marks are impossible to miss, it happens on every skin tone to some degree.
 
If Colour Transfers, Don't Use the Fabric
Nothing fancy is needed for the test itself. A small piece of the fabric will do, ideally from an inside seam where it won't be seen; wet it fully with clean water. Next, the rubbing: wet fabric, firm pressure, about thirty seconds, against a white cloth, a cotton bud or a piece of kitchen paper. Don't put the fabric on her if any colour transfers to the white cloth, because it will stain your doll. The fabric is safe if the white cloth stays clean, and you can use it without worry.
 
Fail It and It Will Stain
Moisture that's naturally present on the doll's skin is what activates the dye transfer, and water simulates it, which is why the test uses water. You want a worst-case scenario, and testing with water gives you one, because wet fabric on damp skin transfers more dye than dry fabric on dry skin. A fabric that passes the water test is safe for normal use. If it fails, it will stain, and there's no way around it.
 
Dye Batches Vary
Even if you've used the same brand before, the test should be repeated for every new piece of clothing. Because dye batches vary and manufacturing processes change, there's no guarantee that a fabric that was safe last year is safe this year. The test takes two minutes, and it's the difference between a doll that looks good for years and a doll with permanent dark marks on her thighs. There's merely no excuse for skipping it; the customers who end up buying replacement dolls are the ones who learned this the hard way.
 
The Worst Offenders
Fabrics most likely to fail are those with dark colours, those with cheap dyes, and anything marginally waxy or coated to the touch. Those concentrated, oil-soluble dyes are found in black, dark red, dark blue and dark purple, the worst offenders. Bright neon colours are a risk as well, thanks to the large amounts of pigment they use. Fabric that's been dyed cheaply is more likely to bleed than fabric that's been dyed properly, which is why expensive clothing is frequently safer than cheap clothing, even though the difference isn't guaranteed.
 
Not Enough Pigment to Stain
The types of fabric that are safest are light colours, natural fibres, and anything that's been pre-washed. With white, cream, beige and pale pastels you're practically invariably safe, because there's not enough pigment to cause noticeable staining. Synthetics let go of dye more readily than cotton, linen and other natural fibres, which tend to hold it more firmly and so bleed less. Excess dye is what tends to transfer onto the doll, and pre-washed fabric has already released most of it, so it's less likely to. Pre-wash any new clothing before putting it on the doll if you're in doubt.
 
What to Try if a Fabric Fails
There are a few things to attempt with a fabric that fails the test before you give up on it. A small amount of white vinegar added to repeated hot washes (several) can help set the dye and lessen bleeding. An overnight saltwater solution soak can also help the fabric, as salt works as a mordant and binds the dye to the fibres. These approaches don't always work, and some fabrics will bleed no matter what you do, but they're worth trying if you really want to use a specific piece of clothing.
 
Neither Is Foolproof
A fabric that still fails after washing is best not used at all; that's the safest option. Replacing a piece of clothing costs far less than a new doll, and a stain on a doll is permanent.Mitigation strategies are available for anyone who's attached to the fabric and wants to use it in any case. A lining of light-coloured fabric on the inside of the clothing puts a barrier between the dark dye and her skin. Or keep the wearing time short, and remove the clothing immediately after use. The risk is minimised by both, though neither is foolproof.
 
Buying Clothes for Your Doll
Buy from retailers who comprehend dye migration and have tested their fabrics; that's the safest way to shop for doll clothing. Doll-specific clothing brands are ordinarily aware of the issue and opt for their fabrics accordingly, which is why their clothing is more expensive but also more reliable. Higher risk comes with cheaper clothing, and generic clothing from high street shops is a gamble anyway. Before utilising generic clothing, invariably test it.
 
Passes in Winter, Fails in Summer
Seasons play a part too, and it's worth knowing about. Warm weather makes dye migration worse, since heat accelerates the process. Summer might bring a failure for a fabric that passed the test in winter, particularly if the doll is stored in a warm room. When purchasing new clothing in summer, be more detailed with the test, and consider several washes before use. If you're storing a doll in a warm room, the same applies, as the heat will make any residual dye migrate faster.
 
Cover It or Accept It
Should it happen, the stain itself is worth understanding. Diffuse, not sharp, is what dye migration stains typically are, since the dye spreads through the material rather than sitting on the surface. The region looks broadly darkened or discoloured, which is quite unlike a clear outline of the fabric. As the stain spreads and deepens, it goes from hard to spot originally to more apparent over time. The doll's history now includes the stain once it's set, unless you cover it with clothing; removal isn't possible.
 
Pressure That Matches the Doll's Skin
Don't overlook the testing method, which matters as much as the test itself. Do the full thirty seconds of rubbing; cutting it short means a slow bleed could slip through. Rub firmly, as though you're trying to remove a stain, because that's the pressure the fabric will experience against the doll's skin. Every test gets a clean patch of the white cloth, as a patch already stained by an earlier test gives a false result. Test wet. Water is what activates the dye transfer, and a dry fabric won't tell you the same.
 
The Dark Parts Are the Ones That Bleed
If you're testing a fabric with multiple colours, test the darkest section first. The dark sections are what will stain the doll, and a fabric might pass on the light sections but fail on the dark ones. Separate tests for separate colours, if you're not sure; and keep a particularly close eye on dark patterns on light backgrounds, because the dark parts are the ones that bleed.
 
Cumulative and Irreversible
Contact time is the next question: how long before a fabric stains the doll? It depends on the fabric, the temperature and the pressure, and varies enormously as a result. It might be an hour for some fabrics, or days or weeks for others, before they stain. Eventually, any fabric that fails the test will stain, so the safest approach is to stay away from it completely. Each exposure adds to the bleed and the bleed can't be reversed, so no exposure time is safe for a fabric that bleeds.
 
Clothing or a New Body to Hide the Damage
If the doll is used, dye migration is worth checking before purchase. You're looking for dark patches on the thighs, back or buttocks, which are where staining is most common. A doll with apparent dye stains is worth less than a clean one, the stains being permanent and affecting her appearance. Haggle: the cost of covering the stains (with clothing or a new body) should be factored into the cost of a used doll with stains, and full price shouldn't be paid.
 
Don't Skip It When You're in a Hurry
The single most critical maintenance habit any doll owner can develop is the wet-white-cloth test. Two minutes, zero cost, and the most usual cause of permanent damage is off the table. Testing every new piece of clothing should become part of your routine; being in a hurry is no excuse to skip it. The five minutes you save by skipping the test could cost you a doll. More info at this rosslink. Also check out  bonuses (http://forum.exalto-emirates.com/viewtopic.php?f=7&t=245515) alongside all  index (https://forum.oldgrumpydog.com/index.php?topic=6380.new) and  take a look at the site here (https://www.registrofiatbarchetta.com/viewtopic.php?f=1&t=2111904) for more.