How to mark bed linen and towels so the laundry doesn't mix them up

"Will we be able to mark them somehow, to tell them apart, for the laundry?" A customer asked us this week, with their order of sheets and towels not yet delivered, and it is the right question at the right moment: before the first wash. White hospitality sheets look very much alike, and in a laundry that processes linen for several properties, whatever cannot be told apart ends up in someone else's bag. A guide published in 2024 by the UK's Textile Services Association (TSA) together with UKHospitality estimates that nearly half of the linen bought each year by the laundries serving hospitality venues is lost, damaged or stolen.

Why the laundry needs your linen to be identified, and what happens to a piece that arrives unmarked, is covered in what an industrial laundry asks of you. This guide is about the practical side: which methods exist, how much work each one takes, how long it really lasts in industrial washing, and where to put the mark so it survives and the guest does not see it.

Before marking anything, ask your laundry

Many laundries do the marking themselves, and others require a specific method. Public tender specifications show this clearly. The one issued by Red de Villas Turísticas de Andalucía for laundering the linen of three of its hotels (2025) forbids mixing its linen "with that of other clients in the sorting, washing, drying or ironing processes" and requires the laundry to "mark the linen in the way agreed with each establishment". The laundry contract of the Madrid Social Care Agency (2025) includes "marking" within the service. And in the Andalusian Health Service contract for Seville and Osuna (2022), the contractor hands out wash-resistant labels and indelible markers at the start to identify linen before its first wash; from then on, it is the laundry that keeps it identified with its system, whether "a chip, an electronic tag or another method".

So the first conversation is with them: whether they mark, with what method, who pays for it, what temperatures and chemicals the mark withstands in their process, and what happens to those marks if you ever change laundry. If the answer is that the marking is up to you, what follows will help you choose.

Temporary marks: quick and short-lived

These are the ones you can apply yourself, today, without a workshop or a machine.

• Permanent textile marker. A few seconds per piece: your initials or a code on the composition label or on the inside of the hem. Laundry marker manufacturers advertise them for washes of up to 95 °C, but none gives a number of washes or says anything about chlorine.
• Textile stamp. Faster than a marker when there are many identical pieces, and more consistent. Some manufacturers give a different resistance depending on where it is stamped: up to 95 °C on fabric and only up to 60 °C on iron-on tape.
• Heat-free adhesive label on the inner seam. The easiest to apply, and the most vulnerable in a tunnel washer: the adhesive is the first thing to give way under heat and tumble drying.

How long do they last? From trade experience, in the order of 15 to 20 industrial washes before they need going over again. High temperature, chlorine and the flatwork ironer, which presses at 160-180 °C, gradually wear away the ink and lift the adhesive. Public tenders are even more conservative: in the Seville one, the marker-on-label mark only has to last until the first wash, because after that the laundry applies its permanent identification.

Put it in proportion. In a hotel, a sheet leaves circulation after about 45 to 80 uses on average, according to the TRSA survey in the renewal guide: with a mark that lasts 15 or 20, it would need going over between two and five times in its life. The Andalusian Health Service laundry tender in Huelva (2024), written for hospital linen, assumes 250 washes per item, and there it would be twelve or more. That is why temporary marks are for what they are good at: an opening before the permanent mark arrives, a trial with a new laundry, a few replacement pieces, or as a back-up to a permanent mark.

Permanent marks: more work once, then nothing

• Heat-seal label. A printed label fixed with heat and pressure in a marking press: a few seconds per piece, but with a machine. A household iron does not provide the even temperature and pressure it needs, and a badly sealed label lifts at one corner within a few washes. What to insist on is ink and adhesive designed for industrial washing. The Government of Aragón's framework agreement for healthcare linen (2025) puts it in writing: marking inks "must be heat-stable at temperatures below 180º", in other words they have to go through the ironer without breaking down.
• Sewn-in label. The safest of all: it depends on no adhesive. It is also the slowest, because it needs sewing piece by piece. For radio-frequency chips, the same Aragón tender accepts both fixings, sewn or heat-sealed, and asks for an estimated life of 200 washes or three years, resistant to detergents, softeners and oxygen or chlorine bleach. Chips are the system of large laundries, and the logic behind them is in the laundry guide.
• Embroidery. A name, initials or a small logo, done by an embroidery workshop. It is permanent if the thread is right: with chlorine in the process, polyester thread, which embroidery thread makers recommend for industrially washed textiles because of its colourfastness to chlorine. Viscose thread, which is shinier, is the one that suffers with bleach. It takes time per piece, adds a little stiffness and has to be ordered in batches.
• Screen printing. Textile ink printed through a screen. It is the usual mark on hospital linen: an Andalusian Health Service framework agreement (2025) asks for a screen-printed emblem in two green 8 cm bands running along the sheet, and Madrid tenders require OEKO-TEX certification for the inks. It lasts very well, but it is a visible mark designed for a hospital, not a hotel room. If you use it, keep it small and in a hem. It needs a screen and a minimum run.
• Woven jacquard. The name, logo or an exclusive design woven into the border of the towel or a band of the sheet. It is the most durable because nothing is added: the mark is the fabric itself, and it lasts as long as the piece. The trade-off is that it is decided at the factory, with a minimum order, and only works for new linen. It is the option for chains and for properties with volume.
• Coloured hem. A coloured thread in the hem seam, or a coloured tape in it. It is discreet, can be spotted at a glance on the folding table and does not need reading. To last, the thread has to be fast to chlorine and temperature, which in practice means polyester thread with good colourfastness, not cotton.

Where to put the mark

The rule is the one the tenders apply: in a hem, on the inside. The flat linen tender of Príncipe de Asturias University Hospital (2024) asks for the chip to be "sewn and hidden in the top or bottom hem" of the sheet, "hidden in the side hem" of the pillowcase and hidden in either hem of the towel. The same goes for a label or embroidery:

• Flat sheet: in the narrow hem at the foot, which is tucked under the mattress. Never in the 5 cm top hem, which is exactly what the guest sees, as we explain in the guide to sheet sizes.
• Fitted sheet: on the inside, at one corner at the foot, next to the elastic.
• Duvet cover: on the inside face, next to the opening or on the flap.
• Pillowcase: in the side hem or inside the flap.
• Towels: in the flat hem at one end, on the reverse. In the pile, ink gets lost among the loops and a label will not grip.

And the same place on every piece of the same type. Whoever sorts at the laundry, and whoever receives the linen in your linen room, finds the mark without looking for it, and that means fewer pieces sent to the wrong place.

Colours: by property, by floor or by size

A colour code saves reading. Well thought out, it is the fastest way to separate; badly thought out, it adds work.

• By property. The most useful case. If you manage several apartments or houses that share a laundry, one colour per property, in the hem or on a small label, gets the linen back to the right place without opening each package.
• By floor. Useful in a hotel where each floor has its own linen room and trolley: it speeds up distribution of clean linen.
• By size. Rarely considered, and one of the biggest time-savers. A folded 90 cm fitted sheet and a 150 cm one look very alike, and a colour per size avoids unfolding pieces in the room to check.
• By room. Almost never worth it. Linen has to rotate across all the beds of the same size for the PAR to work, and a colour per room forces you to wash, store and replace each set separately.

The colour does not have to be on the linen. Laundries already work with colours on what wraps it: the Seville tender asks for the bags to identify the site "according to colour codes" and for each package of clean linen to carry a label of a different colour for each type of linen; NHS Scotland's linen guidance (2026) asks for all bags to be labelled with the care area and dated. If you manage several properties, asking your laundry for bags or labels in one colour per property takes far less effort than marking every sheet.

What the laundry expects from you

• A method agreed with them before the first delivery, not improvised along the way.
• A mark that survives their process: their temperature, their chemicals and their ironer. Ask them what has worked with other clients.
• The mark always in the same place, readable without unfolding the whole piece.
• Nothing metal or paper: no safety pins, no staples, no card tags. They damage the machines and other people's linen.
• A count sheet with every delivery. The mark says whose a piece is; the count says whether they have all come back.

Summary: each method in one line

For most small properties sharing a laundry, the combination that works best is simple: a discreet permanent mark in the hem, heat-sealed or sewn, a colour per property or per size if needed, and the count sheet with every delivery. Temporary marks are for getting by until the permanent ones arrive.