What is a Rainbow Hologram? Diffraction Grating Effect
A rainbow hologram (also known as a Benton hologram after its inventor Dr. Stephen Benton) is a type of hologram that displays a brilliant rainbow spectrum of colours when viewed in white light (sunlight or ordinary indoor light). Unlike true‑colour holograms (which reproduce realistic colours), a rainbow hologram does not attempt to match the object’s natural colours. Instead, it uses a diffraction grating to split white light into its constituent colours – red, orange, yellow, green, blue, indigo, violet – creating a striking, iridescent effect. Rainbow holograms are the most common type of hologram found on credit cards, banknotes, product authentication labels, and security stickers. They are mass‑produced by embossing, making them affordable while providing a high level of counterfeit deterrence. The diffractive structure is extremely difficult to copy with standard scanners or printers.
At Holoseal – a trusted hologram supplier with 15+ years of experience – we provide high‑quality rainbow hologram labels, strips, and foils. Our rainbow holograms combine bright, attractive colours with optional security features (microtext, UV, tamper‑evident) and are used by clients across India and worldwide for pharmaceuticals, electronics, auto parts, and consumer goods.
🔍 How a Rainbow Hologram Works – Diffraction Grating Principle
A rainbow hologram is essentially a complex diffraction grating. A diffraction grating is a surface with thousands of fine, parallel grooves per millimetre (typically 500–2000 lines/mm). When white light (which contains all colours) hits these grooves, each colour is diffracted at a slightly different angle. The result is a rainbow spectrum that shifts as you tilt the hologram.
In a rainbow hologram, the grooves are not uniform – they are arranged in a pattern that forms an image (e.g., a logo or text). When you tilt the hologram, the rainbow colours sweep across the image, creating a dynamic, eye‑catching effect. Because the grooves are microscopic and precisely aligned, they cannot be copied by a standard printer or photocopier.
⚙️ How Rainbow Holograms Are Made
- Master origination – A laser records the interference pattern on a photoresist plate, creating the rainbow effect. This step is done in a clean room using specialised optics.
- Electroforming – The photoresist master is used to produce a nickel shim (stamper).
- Embossing – The shim stamps the diffraction grating pattern into a metalized PET film under heat and pressure. This mass‑produces the rainbow hologram on a roll.
- Finishing – The roll is slit, die‑cut into labels, and optionally overprinted with serial numbers or UV features.
This process allows millions of identical rainbow hologram labels to be produced at a low cost per unit.
🛡️ Types of Rainbow Holograms
- 2D rainbow hologram – Flat, single‑layer image. Appears as a shiny logo or pattern with rainbow colours. Lowest cost, widely used for promotions and basic security.
- 2D/3D rainbow hologram – Has two or more flat layers at different depths, creating an illusion of depth while retaining rainbow colours.
- Dot matrix rainbow hologram – Made of tiny diffractive pixels that can show animation and colour‑shifting text, still rainbow‑like.
- Rainbow DOVID (diffractive OVD) – Includes kinetic effects (rolling bar, flip‑flop) while maintaining a rainbow appearance.
🔐 Rainbow Hologram vs. True‑Color Hologram
- Rainbow hologram – Spectral colours (rainbow). Mass‑produced by embossing. Low cost. Used on most security labels and consumer products.
- True‑color hologram – Realistic colours (e.g., skin tones, green grass). Complex origination, higher cost. Used for high‑security documents and premium goods.
📦 Rainbow Hologram Products We Supply
- Rainbow hologram labels – Self‑adhesive, custom shape, any quantity. Can be combined with VOID or destructible adhesive.
- Rainbow holographic strips – Narrow rolls for document security, tamper‑evident seals.
- Rainbow holographic stamping foils – Hot‑stamped onto cartons, cards, and certificates.
- Rainbow holographic films – Large sheets for lamination, packaging, and decorative use.
🏭 Common Applications of Rainbow Holograms
- Credit & debit cards – The classic hologram on Visa, Mastercard, etc. – typically a rainbow hologram of a dove or globe.
- Pharmaceutical labels – Rainbow holograms on medicine boxes help patients and pharmacists detect counterfeits.
- Electronics & IT products – Laptop boxes, phone chargers, and batteries often carry rainbow hologram authenticity seals.
- Automotive spare parts – Rainbow hologram labels on genuine parts packaging.
- Cosmetics & FMCG – Premium shampoos, perfumes, and creams use rainbow holograms to enhance shelf appeal and deter fakes.
- Promotional & event stickers – Rainbow holographic stickers for branding, giveaways, and decorations.
🕵️ How to Verify a Rainbow Hologram (For Consumers)
- Tilt the label under any light source (sun, room light, phone flashlight).
- Look for bright rainbow colours that shift from red to green to blue as you tilt.
- Check for any image movement or 3D depth (depending on the hologram type).
- A genuine rainbow hologram will show clear, vibrant colours. A fake rainbow sticker will look dull, static, or have flat colours.
🌍 Holoseal’s Rainbow Hologram Sourcing
We supply rainbow hologram labels for clients in Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Pune, Ahmedabad, Kolkata, Surat, Kochi, Jaipur, Lucknow, Nagpur, Indore, Vadodara, Ludhiana, Patna, Guwahati, Chandigarh and worldwide, we provide custom‑designed rainbow hologram labels in roll or sheet form, with optional overprinting (serial numbers, QR codes). With 15+ years of experience, we help you select the right rainbow effect (2D, 2D/3D, dot matrix) to match your brand and budget.
❓ Frequently Asked Questions About Rainbow Holograms
Why are rainbow holograms so common on security labels?
They are cost‑effective, easy to verify (tilt test), and provide a high level of counterfeit deterrence. No printer or copier can reproduce the rainbow diffraction effect.
Can I see a rainbow hologram in the dark?
No – it requires light. The brighter the light, the more vivid the colours. A smartphone flash works well.
Are rainbow holograms waterproof?
Yes – the embossed film is waterproof. However, overprinted ink (e.g., serial numbers) may not be. We offer clear top coats for extra protection.
How much does a custom rainbow hologram label cost?
Master origination for a custom 2D rainbow hologram starts at around ₹50,000–1,50,000 ($600–1,800 USD). Per‑label cost in volumes of 100,000+ is a few paise to a couple of rupees. We provide quotes based on design complexity and quantity.
Can I add a QR code on top of a rainbow hologram?
Yes – we can overprint a QR code with opaque black ink, making it scannable while preserving the rainbow background. Laser demetalisation is another option for a durable, premium look.
How to order a rainbow hologram from Holoseal?
Provide your artwork (vector format), desired size, shape, quantity, and any additional features (serialisation, tamper‑evident, UV). We will create a design proof, produce a sample, then mass supply. Contact us for a quote.
