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A client rings on a Thursday afternoon. She wants her roots done before a wedding on Saturday. She's new to you, and she's never had colour at your salon. The honest answer is that Saturday might not be possible, because she needs a skin test first and that test has to sit for a couple of days. How your front desk handles the next 30 seconds decides whether she books with you or rings the salon down the road.
Skin tests, allergy alert tests, patch tests: whatever you call them, they protect your clients and your business. They also create a timing problem that lands straight on the phone, and it's easy to lose a booking in the gap between "I'd love to come in" and "right, so when can I actually come in?"
Permanent and some semi-permanent hair dyes contain PPD (paraphenylenediamine). The NHS describes PPD as the main cause of hair dye reactions, and notes that darker shades tend to contain more of it. A reaction can be mild, like an itchy, inflamed scalp, or it can be serious, and the symptoms don't always show up straight away. They can take hours or even a couple of days to appear, which is the whole reason a test needs time to sit.
Dermatologists back this up. DermNet lists PPD as the main allergen in hair dye and makes a point worth repeating honestly to nervous clients: a negative patch test lowers the risk but doesn't guarantee someone won't react, because the test itself can occasionally sensitise a person.
It isn't only colour. Lash extension adhesive is built on cyanoacrylate, the ingredient behind most true lash allergies, and reactions there can be delayed too. Lash suppliers like London Lash make the same point the dermatologists do: a clear patch test isn't a cast-iron promise, so it's a safety step rather than a box to tick. Tints, some spray tans and a few other treatments carry their own testing needs as well.
The National Hair & Beauty Federation (NHBF) is clear on timing: an allergy alert test should be done no less than 48 hours before the colour service, because a reaction can take up to 48 hours to develop. Its harmonised testing FAQs add the detail your team needs to get right: the client waits 45 minutes at the test appointment, then keeps an eye on the area for the next 48 hours, and you keep a written record of every test for six years.
Testing isn't a one-off either. The NHBF guidance says existing colour clients should be retested around every six months, and always when the product or brand changes. Lash guidance runs along similar lines; suppliers such as LashBase recommend a patch test for every new client and for anyone who hasn't been in for more than six months.
Then there's your insurance. BABTAC treats patch testing as a condition of cover and has written about claims that were refused because a therapist skipped the test. So the stakes aren't only a bad reaction. Get the testing wrong and a claim you were counting on might not pay out. If you're not sure where your own policy stands, that's a five-minute call to your insurer worth making this week.
Here's the catch. Most clients don't ring to book a patch test. They ring to book colour, usually for soon, and often the day or two before they want it. New clients frequently don't know a test exists until you tell them. So the person answering the phone has to turn "can I come in Saturday?" into "let's get your test done today or tomorrow, then you're set for Saturday", and do it without making it sound like hassle.
Miss that call and the window closes. A voicemail doesn't rescue it, because the timing is already tight and most people won't wait around. CallRail's survey of 1,000 consumers found that 78% had given up on a business after a single unanswered call. For a colour booking that needs a test 48 hours ahead, a missed call on Thursday doesn't lose one appointment. It loses the test window, then the Saturday slot, and often the client with it.
Three quick questions sort almost everyone: are they new to the salon, is this a new brand or formula for them, and when was their last test. A new client, or an existing one changing product or overdue by six months, needs one. Someone coming back for the same colour inside the window usually doesn't. Knowing which is which in the first 20 seconds lets you give a straight answer instead of "I'll have to check and call you back".
The booking is only safe once the test is in the diary. If the client can pop in, book a quick test now and the colour at least 48 hours later, in the same call. If they can't get to you in time, some salons post out a test kit or arrange for the client to collect one, so the clock can start sooner. Either way, say the gap out loud and confirm it, so nobody turns up on the day expecting colour that can't safely go ahead.
People don't mind a short wait when they understand it. A line like "it's a quick skin test we do before your first colour, it needs to sit for two days, and it keeps you safe" lands far better than a flat "we can't do Saturday". You're not fobbing them off. You're the salon that took their safety seriously, and that's a reason to come back.
The trouble is that the calls that need this handled well are the same ones your team can least afford to stop for. A stylist mid-foils isn't going to down tools to explain patch test timing, and the front desk is often with a client or already on another line. That's the gap CallPad fills.
Amy, CallPad's voice assistant, answers every call in your salon's name and handles the patch test conversation the way your best receptionist would. She can check whether a caller is new, flag that a test is needed before colour, book the test in a slot that leaves the 48 hours clear, and book the colour after it. She texts the client a confirmation with the timing spelled out, and passes anything that needs a human, like a client describing a past reaction, straight to your team. She picks up when your people can't, so the Thursday-afternoon call still becomes a Saturday booking.
Patch tests aren't going anywhere, and they shouldn't. But they don't have to cost you bookings. Answer the call, ask the right questions, and get the test in the diary, and the rule that keeps your clients safe stops being the thing that sends them elsewhere.
New clients always need one, and existing clients should be retested around every six months and whenever the product or brand changes, in line with NHBF guidance. Your insurer and the dye manufacturer may set stricter rules, so check your own policy.
The NHBF says an allergy alert test should be carried out no less than 48 hours before a hair colour service, because a reaction can take up to 48 hours to develop.
Not if they are new or need a fresh test, because the test has to sit for 48 hours first. The best approach is to book the patch test straight away and the colour appointment at least two days later, so the booking stays safe.
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