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How To Avoid Dye Migration: A Simple Wet-White-Cloth Fabric Test
The most major advice a new doll owner will ever get is also the advice they're most likely to ignore. Once dark fabric has transferred colour onto the doll's skin, which is what dye migration is, there's no going back. Try every cleaning item and method going and scrub all day; a stain that's been absorbed into TPE won't come out. If you want a defence, prevention is the only one, and a straightforward test taking two minutes at no cost is where it starts.

TPE Is Oil-Based, Dark Dyes Are Oil-Soluble
Chemistry is the reason this occurs. Picture a sponge taking in water: that's the dye migrating from the fabric into the TPE, helped along by TPE being oil-based and dark dyes being typically oil-soluble. The process starts straight away on contact and accelerates with heat and pressure, so a dark dress left on a doll for a few hours in a warm room is enough to cause a permanent stain. Dark marks on pale dolls are impossible to miss, which is why it's particularly noticeable on them, though it happens on every skin tone to some degree.

Cotton Bud, Kitchen Paper or White Cloth
Nothing fancy is needed for the test itself. Take a small piece of the fabric, ideally from an inside seam where it won't be seen, and wet it thoroughly with clean water. Something white is the target, a cloth, cotton bud or kitchen paper, and you rub the wet fabric against it firmly for about thirty seconds. Colour on the white cloth? Then the fabric will stain your doll, and you should not put it on her. You can use the fabric without worry if the white cloth stays clean, since it's safe.

Fail It and It Will Stain
Simulating the moisture naturally present on the doll's skin, water activates the dye transfer in the test just as that moisture does in real life. Dry fabric on dry skin transfers less dye than wet fabric on damp skin, so testing with water gives you a worst-case scenario, which is precisely what you want. A fabric that passes the water test is safe for normal use. Fabric that fails will stain, and nothing gets around that.

The Hard Way Means Replacement Dolls
Don't assume a brand you've used before is fine: repeat the test for every new piece of clothing. Changing manufacturing processes and varying dye batches mean a fabric that was safe last year might not be safe this year. What the test takes is two minutes; what it gives you is a doll that looks decent for years instead of permanent dark marks on her thighs. Skipping it is inexcusable, and buyers who learn the hard way are the ones who end up buying replacement dolls.

Dark Colours, Cheap Dyes and Waxy Coatings
Expect failures from dark colours, cheap dyes, and anything with an a little waxy or coated feel. Black, dark red, dark blue and dark purple offend worst, since the dyes are concentrated and oil-soluble. Don't overlook bright neon colours, which are risky because they use sizable amounts of pigment. You're more likely to see bleeding from fabric that's been dyed cheaply than fabric dyed properly, so costly clothing is often safer, even if the difference isn't guaranteed.

Why Natural Fibres Bleed Less
As for the safest types of fabric, think light colours, natural fibres, and anything that's been pre-washed. These pale shades, white, cream, beige and pastels, are practically always safe, there not being enough pigment to cause apparent staining. Natural fibres like cotton and linen grip dye more firmly than synthetics tend to, so they're less likely to bleed. The wash has already released most of the excess dye from pre-washed fabric; transfer onto the doll is less likely as a result. Any new clothing should be pre-washed before it goes on the doll, when in doubt.

Worth Trying for a Favourite Piece
A failed fabric isn't necessarily a lost cause; a few things are worth attempting first. Wash it a number of times in hot water, adding a small amount of white vinegar; this can help set the dye and lessen bleeding. Bind the dye to the fibres with salt, which acts as a mordant, by soaking the fabric in a saltwater solution overnight. These techniques don't invariably work, and some fabrics will bleed no matter what you do, but they're worth attempting if you really want to use a specific piece of clothing.

Remove It Immediately After Use
Safest by far is to not use a fabric that still fails after washing. Stains on dolls are permanent, and a new doll is far more expensive than a replacement piece of clothing.You might be attached to the fabric and want to use it regardless; if so, a few mitigation strategies are there. Try a light-coloured inner lining; it acts as a barrier between the dark dye and the doll's skin. The other way is to use the clothing for short durations only and take it off straight away after use. Neither is foolproof, though both minimise the risk.

Cheaper Clothing, Higher Risk
If it's clothing for a doll you're after, opt for a retailer who understands dye migration and has tested their fabrics, as that's safest. That doll-specific clothing brands are usually aware of the issue and pick their fabrics accordingly explains why their clothing is more expensive but also more reliable. With generic clothing from high street shops you're gambling, and cheaper clothing means higher risk. Consistently test generic clothing before use.

Test More Thoroughly in Summer
There's a seasonal factor to know about as well. Heat speeds the process up, which is why dye migration is worse in warm weather. Passing in winter proves little, since the same fabric might fail in summer, especially if the doll is stored in a warm room. In summer, test new clothing more thoroughly and consider washing it several times before use. Any residual dye will migrate faster in the heat, so the same applies if you're storing a doll in a warm room.

What a Dye Migration Stain Looks Like
Understanding the stain itself is worthwhile, if it ever occurs. The dye spreads through the material rather than sitting on the surface, so dye migration stains are normally diffuse rather than sharp. What shows up is a general darkening or discolouration, and there's no clear outline of the fabric. This means a stain that's harder to spot at first but more obvious over time, since it spreads and deepens. Once it's set, it can't be removed, and the only choices are to cover it with clothing or accept it as part of the doll's history.

Rub as Firmly as You Would on a Stain
Method matters just as much as the test itself. Don't skimp on the thirty seconds of rubbing, because a quick rub can miss a slow bleed. Scrub like you mean it, as though a stain needs removing, because that's the pressure the doll's skin will put on the fabric. If the cloth is already soiled from a previous test, the result will be false, so use a fresh section of the white cloth every time. And test the fabric wet rather than dry, because water is what activates the dye transfer.

Fabrics With Multiple Colours
With a multi-coloured fabric, test the darkest section first. What will stain the doll are the dark sections, and a fabric might pass on the light ones but fail on the dark ones. Watch fabrics with dark patterns on a light background particularly closely; the dark parts bleed. When unsure, test each colour separately.

Contact Time and Staining Risk
So how long does the fabric have to be in contact with the doll for staining to happen? It varies massively, depending on the fabric, the temperature and the pressure. There are fabrics that will stain within an hour and others that take days or weeks. Fail the test and the fabric is out: the safest approach is to assume it will stain finally. There's no safe exposure time for a fabric that bleeds, because the bleed is cumulative and irreversible.

Permanent Stains Affect Appearance and Value
Buying a used doll? Check for dye migration before you purchase. Staining is most widespread on the thighs, back and buttocks, so look there for dark patches. The stains are permanent and influence the doll's appearance, which is why a doll with visible dye stains is worth less than one without. Used with stains? Don't pay full cost, and remember to factor in what covering them would cost, whether that's clothing or a new body.

Preventing the Most Common Permanent Damage
Of all the maintenance habits a doll owner can develop, the wet-white-cloth test is the single most significant. The most typical cause of permanent damage is prevented by a test that takes two minutes and costs nothing. In a hurry? Test regardless. Every new piece of clothing, as part of your routine. By skipping the test you save five minutes, and that could cost you a doll. More info at this rosslink. Also check out check my site as well as check and yoururl.com for more.
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