Rainbow Hologram V/s True‑Color Hologram
Rainbow holograms (also called Benton holograms) are the most common type of security hologram. They are created using a single laser wavelength (typically green or blue). When viewed in white light, they display a brilliant, iridescent rainbow spectrum but do not reproduce the natural colours of the object. The image shifts through red, green, blue as you tilt the label. Rainbow holograms are cost‑effective, mass‑produced by embossing, and used on credit cards, banknotes, and product labels. True‑color holograms are recorded using three laser wavelengths (red, green, blue) simultaneously or sequentially. They reproduce the original colours of the object – skin tones, green leaves, blue sky – with remarkable realism. True‑color holograms are much more complex and expensive to originate, and they are typically produced as volume holograms (photopolymer) rather than embossed. They are used for high‑security documents (e‑passports, ID cards) and premium brand protection where realistic colour is required. Holoseal primarily supplies rainbow holograms for cost‑effective security, but can advise on true‑color options for specialised applications.
🔬 Detailed Comparison: Rainbow Hologram vs. True‑Color Hologram
| Aspect | Rainbow (Benton) Hologram | True‑Color (Full‑Colour) Hologram |
|---|---|---|
| Recording Laser Wavelengths | Single wavelength (usually green 532 nm or blue 488 nm). | Three wavelengths: red (632 nm), green (532 nm), blue (488 nm). |
| Colour Appearance | Iridescent rainbow – colours change with viewing angle. No realistic colour reproduction. | Realistic, natural colours – skin tones, grass, sky. Colour does not change significantly with tilt. |
| Viewing Light | White light (sunlight, lamp) – works well. | White light – requires broader spectrum for accurate colour. Some true‑colour holograms need halogen or LED. |
| Manufacturing Process | Embossed (mass production from nickel shim). Inexpensive per unit. | Usually volume holograms (photopolymer) – each copy is individually recorded or contact‑copied. Expensive. |
| Origination Complexity | Low to moderate – single laser, single photoresist exposure. | Very high – precise alignment of three lasers, panchromatic photoresist, multi‑step processing. |
| Master Cost | Low – ₹50k–2 lakhs. | Very high – ₹10–50 lakhs or more. |
| Per‑Unit Cost (volume) | Very low – ₹0.20–10 (embossed). | High – ₹50–500+ (volume photopolymer). Not suitable for high‑volume labels. |
| Security Level | High – overt rainbow effect is still difficult to counterfeit. Suitable for most brand protection. | Extremely high – true colour is very hard to replicate; often combined with DOVID and forensic features. |
| Typical Applications | Credit cards, banknotes, pharmaceutical labels, electronics, FMCG. | E‑passport data pages, high‑value ID cards, museum holograms, premium brand authentication. |
🔍 What is a Rainbow Hologram?
A rainbow hologram (invented by Dr. Stephen Benton in 1968) is the standard embossed hologram. It is recorded with a single laser and a slit to control colour dispersion. When viewed, the hologram diffracts white light into a rainbow spectrum – the same effect as a CD or DVD. Rainbow holograms are:
- Inexpensive to mass‑produce (embossing)
- Very bright and eye‑catching
- Can incorporate 2D/3D depth, DOVID kinetic effects, microtext, etc.
- Used on virtually all security labels, credit cards, and banknote threads
🔍 What is a True‑Color Hologram?
A true‑color hologram is recorded using red, green, and blue lasers to capture the full colour spectrum of the object. The recording material must be panchromatic (sensitive to all three colours). After processing, the hologram reproduces the original object colours. True‑color holograms are typically volume holograms (photopolymer) because they require thick recording media to separate colour channels. They are:
- Visually stunning and realistic
- Extremely difficult to counterfeit
- Expensive – each unit is costly, mass production is limited
- Used on passports (e.g., portrait on data page), high‑value ID cards, and art reproductions
🔐 Which One Should You Choose?
- Choose Rainbow Hologram – For nearly all brand protection labels, product authentication, and high‑volume applications. It provides excellent overt security at a low cost. Holoseal specialises in custom rainbow holograms (2D/3D, DOVID) with additional covert features.
- Choose True‑Color Hologram – Only when realistic colour is a requirement (e.g., a passport photo, a collectible art piece, or a high‑security ID card where colour authenticity matters). Budget and volume must accommodate the higher cost.
- Hybrid Approach – Some high‑security documents combine a rainbow DOVID (kinetic effects) with a small true‑color patch for the portrait.
🌍 Real‑World Examples
- Rainbow hologram on a Visa credit card – The classic dove shifts colours as you tilt the card.
- True‑color hologram on a passport data page – A realistic portrait of the holder, visible when tilted, with natural skin tones.
- Rainbow DOVID on a pharmaceutical label – A rolling bar or image‑switching effect – bright and obvious.
- True‑color hologram on a museum display – A replica of a famous painting or artifact with accurate colours.
❓ Frequently Asked Questions
- Is a rainbow hologram less secure than a true‑color hologram? – No, both are secure. Rainbow holograms with DOVID and microtext are very hard to counterfeit. True‑color offers an additional layer of complexity but at much higher cost.
- Can I get a true‑color embossed hologram? – Very rare. True‑colour requires volume recording; embossed holograms are surface relief and typically produce rainbow colours. Some hybrid techniques exist but are not common.
- Which is more expensive? – True‑color holograms are orders of magnitude more expensive due to master complexity and limited mass production.
- Do consumers prefer rainbow or true‑color? – Consumers are familiar with rainbow holograms on credit cards and banknotes. True‑colour is impressive but often unnecessary for product labels.
- How to order rainbow hologram labels from Holoseal? – Provide your artwork, desired effects (2D/3D, DOVID), and volume. We will produce a master and samples. Contact us for a quote.
