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Hi there, I'm Jarvis! I see you're looking at the Allergen Safety Chef's Knife | 20cm Kitchen Knife | Purple Colour Coded | Mercer Culinary FB501. How can I help you with the technical specs or suitability for your business today?

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Mercer Culinary In Stock

Allergen Safety Chef's Knife | 20cm Kitchen Knife | Purple Colour Coded | Mercer Culinary FB501

SKU: FB501
£41.98 / exc vat
£50.38/ inc vat
  • Purple Colour-Coding
  • High-Carbon Japanese Steel
  • Ergonomic Santoprene Handle
  • Textured Finger Points
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Features Overview Specifications Case Study Reviews Installation Buying Guide FAQ

Product Overview

Stepping up your kitchen's safety game has never been easier. This isn't just another knife; it's the Mercer Culinary FB501, a purpose-built tool designed to make allergen cross-contamination a thing of the past. Its instantly recognisable purple handle signals that it's for one job only: preparing food safely for customers with allergies, giving you and  your team complete peace of mind during a busy service.

Crafted for the demanding environment of a professional kitchen, this 20cm purple chef knife is the perfect partner for chefs in restaurants, schools, hospitals, and  cafes. The blade is forged from high-carbon, stain-free Japanese steel, meaning it gets razor-sharp and  stays that way. Paired with a seriously comfortable and  non-slip ergonomic handle, it feels like a natural extension of your hand, offering precision and  control with every slice.

Ultimately, this is about more than just compliance. It's about showing you care, protecting your customers, and  equipping your kitchen with a professional-grade tool that won't let you down. With its world-class steel and  dedicated safety focus, this purple colour coded chef's knife is an essential addition for any kitchen that takes food safety seriously.

Key Features and  Benefits

  • Purple Colour-Coding: Instantly identifies the knife for dedicated allergen-free food prep.
  • High-Carbon Japanese Steel: Stays wickedly sharp longer and  is a doddle to resharpen.
  • Ergonomic Santoprene Handle: Gives you a comfortable, firm grip, even when wet.
  • Textured Finger Points: Stops your hand from slipping for safer, more precise cutting.
  • Protective Finger Guard: Adds that extra bit of safety during fast-paced services.
  • One-Piece Forged Construction: Makes it incredibly hygienic and  a breeze to clean properly.
  • NSF Certified: Independently certified to meet top public health and  safety standards.
  • Versatile 20cm (8”) Blade: The perfect all-rounder size for most kitchen chopping tasks.

Technical Specifications

  • Brand: Mercer Culinary
  • SKU: FB501
  • Blade Length: 20cm (8")
  • Colour: Purple (For Allergen-Specific Use)
  • Dimensions: 10(H) x 40(W) x 445(D) mm
  • Weight: 0.23kg
  • Blade Material: High Carbon, Stain-Free Japanese Steel
  • Handle Material: Santoprene & Polypropylene
  • Certification: NSF Certified

Expert Review and  Insights

In today's world, a robust allergen policy is non-negotiable, and  colour-coded equipment is at the heart of it. What I like about this Mercer Culinary knife is that they haven't just painted a handle purple; they've built a genuinely top-quality chef's knife. The Japanese steel is superb, and  the handle ergonomics are spot-on for long shifts. It’s a proper, professional tool designed for a critical task.

Sophie Brooks – Chef Tools Expert View Profile →

  • Top-Tier Blade: The Japanese steel holds an exceptionally sharp edge, cutting beautifully.
  • Dedicated Use: Its specific purpose means it shouldn't be used as a general workhorse.

Case Study: Real Business, Real Results

The Copper Kettle, a bustling café in York, needed to streamline its expanding gluten-free menu offering and  eliminate any risk of cross-contamination from their main prep area.

"We needed a foolproof system that was easy for everyone to follow, especially during the mad lunch rush. The purple knives are instantly recognisable and  the quality is fantastic. The team feels so much more confident now."

Robert Hughes – Head Chef, The Copper Kettle

The result? They have completely eradicated cross-contamination errors in their allergen-free prep area and  significantly improved kitchen workflow and  staff confidence.

Installation and  Maintenance Guide

First Use & Daily Care

  • Before its first use, give the knife a good wash in warm, soapy water.
  • Always use it with a designated purple chopping board to maintain the safety system.
  • Store it separately, preferably in a knife block or on a magnetic strip, away from other utensils.
  • Hand wash and  dry immediately after use. This is the golden rule for any quality knife!

Keeping It Sharp

  • Hone the blade regularly with a sharpening steel to keep the edge aligned. A few strokes before each use is ideal.
  • When honing isn't enough, give it a proper sharpen on a whetstone or use a professional service.
  • Never, ever put it in the dishwasher; the harsh detergents and  high heat will ruin the blade's edge and  handle.
  • A sharp knife is a safe knife, and  a well-cared-for knife will last you for years.

Buying Guide: Choosing the Right Commercial Knife

Not sure what to look for in a professional kitchen knife? Here’s a quick rundown to help you choose the best tool for the job.

Colour-Coding is Key

For food safety, colour-coding is essential. Purple is the UK industry standard for allergen-free and  gluten-free products. Using it correctly prevents dangerous cross-contamination.

The Steel Matters

Look for high-carbon steel, like the Japanese steel in this knife. It holds a sharper edge for longer and  is easier to maintain than cheaper stainless steel alternatives.

Handle with Confidence

An ergonomic, non-slip handle is a must for safety and  comfort. Materials like Santoprene offer excellent grip, even when your hands are wet or oily.

Find Your Balance

A well-balanced knife, where the weight is evenly distributed between the blade and  handle, feels more controlled and  causes less fatigue during long prep sessions.

One-Piece Construction

Knives forged from a single piece of steel (a 'full tang' or solid one-piece design) are stronger and  more hygienic as there are no gaps for food to get trapped in.

See all Chefs Knives

Frequently Asked Questions

Q: What is the purple colour specifically for?

A: In the UK's colour-coding system, purple is designated for preparing foods for customers with allergies, particularly gluten-free, to prevent cross-contamination.

Q: Is this knife dishwasher safe?

A: We strongly advise against it. To protect the razor-sharp edge and  the integrity of the handle, you should always hand wash your professional knives.

Q: What makes Japanese steel special?

A: Japanese steel is a high-carbon steel renowned for its ability to take and  hold an incredibly sharp edge. It's the choice of professionals for its precision and  performance.

Q: Is the handle slippery when wet?

A: Not at all. The handle is made with Santoprene, a material specifically chosen for its excellent non-slip properties, giving you a secure grip in all conditions.

Q: What does NSF Certified mean?

A: It means the knife has been rigorously tested and  certified by NSF International to meet strict standards for public health protection and  safety.

Q: Can I chop bones with this knife?

A: This is a chef's knife designed for slicing, dicing, and  chopping vegetables and  boneless meats. For bones, you should always use a heavy-duty meat cleaver.

Q: How long is the blade?

A: The blade measures 20cm (or 8 inches), which is widely considered the most versatile and  useful size for an all-purpose chef's knife.

Q: Can I just use this as my main knife?

A: To ensure it remains effective for its purpose, this knife should be strictly reserved for allergen-free prep only. This avoids any chance of cross-contamination.

What Customers Are Saying

"Brilliant knife. Sharp, comfortable, and  the purple handle makes it impossible to mix up. A must for any kitchen that's serious about allergens."

Samantha D. – Catering Manager, Manchester

"Great weight and  balance, feels like a much more expensive knife. Stays sharp for ages. We bought one and  immediately ordered more for the team."

Tom P. – The Corner Deli, Brighton

"Does the job perfectly for our gluten-free station. The handle is really grippy, even with wet hands. A solid, reliable piece of kit."

Michael B. – University Canteen, Edinburgh

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The Mercer Culinary Standard: Safety Meets Performance

Mercer Culinary has built a formidable reputation by creating tools that solve real-world kitchen problems. This purple colour coded chef's knife is a perfect example of that philosophy. It's not just a knife with a coloured handle; it's a critical component of a modern food safety system. Investing in a tool like the FB501 is about more than just having great gear; it's about building trust. It shows your customers, your staff, and  environmental health officers that you are deeply committed to preventing cross-contamination. This knife pays for itself not just in its long-lasting sharpness and  durable build, but in the prevention of costly, dangerous mistakes that could damage your reputation. It's a smart, reliable investment in operational excellence.

Explore more from Mercer Culinary

Why the Dual-Material Handle Matters for All-Day Comfort

You might see 'Santoprene and  Polypropylene handle' and  skim past it, but it's genuinely one of this knife's best features. Polypropylene is the hard, durable plastic that forms the inner core of the handle, giving it strength and  structure so it can withstand the rigours of a commercial kitchen. Santoprene is the softer, slightly rubbery material that's moulded over the top. This is what gives you that brilliant, non-slip grip.

Think of it like a top-quality hiking boot. You have the tough, rigid sole (polypropylene) that provides stability and  a long life, combined with the soft, cushioned inner lining (Santoprene) that keeps you comfortable and  prevents your foot from slipping. It’s the best of both worlds: tough where it needs to be, and  comfortable where you hold it, which makes a huge difference over a long shift.

Who Should Buy This?

  • Restaurants & Bistros: A must-have for the prep station to prevent cross-contamination with gluten-free or other allergen-sensitive dishes.
  • School & University Kitchens: Essential for safely preparing meals for students with specific dietary requirements and  serious allergies.
  • Care Homes & Hospitals: Guarantees patient food safety by dedicating a specific, high-quality knife for special diet preparations.
  • Bakeries & Delis: Perfect for slicing gluten-free bread or preparing allergen-free fillings without a trace of risk.
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