Hidden Hair Colour Ideas With Underlights & Hidden Rainbow Hair

March 14, 2022

When it comes to showing off your true colours, there are few other ways to express yourself than with a bold hair colour or style. Well, the 2022 trends are here and Australia is going mad for underlights and hidden colours.


Ideal for a more subtle aesthetic or for those working in jobs that have stricter rules about hair colour, let’s find out more about so-called hidden hair colours.

What are underlights?


Also known as the ‘secret strand’, this colouring technique dyes layers or strands of hair below the top layers so that the colour (usually natural tones) covers the underlights (usually bold, unnatural colours).

Any colours can be used and the extra freedom it gives clients is undeniable.

Trending underlight styles


The choices don’t end there, either. This colouring technique comes in a variety of styles.


Peekaboo colours


These involve a colour applied underneath the hair so that it is only visible when the hair is pulled up into an updo. This might be along the edges, curling down under the fringe or up at the back. Whether long hair, an undercut, curly hair, or something else – this style can fit them all.

Image Source: Pinterest

Hidden rainbows


This show-stopping look is created by colouring the hair in sections to create a rippling rainbow effect in bold and bright or subtle and pastel. Hidden rainbow styles work particularly well at the back with the natural hair pulled up into a half-bun.


Quirky tips


If you’re looking for a hidden rainbow that’s even more subtle, this is the style for you. Just the tips are coloured rainbow for a fresh and unique look that suits both long and short hair.


How to style your hidden coloured hair


Depending on where you’ve had your colouring, you can experiment with half-updos, French plaits, and messy buns to easily show off your secret colours. Try curling your hair or, if you have black hair, try braiding it into sections to show off cheeky snatches of colour.

Image Source: Pinterest

The best colours for hidden hair


We recommend balancing the tones of the top and bottom colours of your hair. If you want to stick to your natural hair colour on top, we suggest colours like blue, purple, and green work well for cool hair tones while red, orange, and pink complement warmer tones.

However, the joy of hidden hair colours is that the choice is yours. You can be as out of the box or as subtle as you like.


Why hidden hair colours are growing in popularity: Ideal for bold hair in a not-so-bold job


Want to show off your personality and vibrance with an equally vibrant hair colour? Of course! Working in a job that doesn’t appreciate unnatural hair colour and for whatever reason imposes strict regulations on colour? Not so great.


Luckily, the hidden colour hair trend is ideal. Whether you wear your hair up or down, under a beret, under a hairnet, or loose and unbound – talk to us at Strut Hair and Beauty and we’ll work out the best treatment plan for you.

Hair being straightened with a flat iron. Hand holding hair section, black flat iron pressing it straight — Strut Hair & Beauty In Maroochydore, QLD
By Constance Zaborov September 30, 2025
You’ve likely heard of keratin and nanoplasty hair straightening treatments, but how do you know which is right? Whether you have Afro hair, curly hair, or are seeking smooth, frizz-free locks, understanding the core differences between these two popular options can help you make the best decision for your hair goals. Permanent and non-permanent straightening treatments offer different results, maintenance levels, and longevity. If you're contemplating an appointment and aren’t sure whether you’re after a temporary refresh or a long-term change, this guide will break down everything you need to know—clearing up confusion, busting myths, and ensuring you feel confident before committing to either option. Let’s explore the key differences between keratin and nanoplasty so you can decide which path suits your lifestyle, hair type, and preferences. Understanding Keratin Straightening & How It Works Keratin straightening is a smoothing treatment, not a restructuring one. It infuses hair with keratin, a naturally occurring protein in hair to coat the outer layer, reducing frizz and enhancing shine without changing the internal structure of the hair shaft. This is considered a non-permanent straightening option, and it is ideal for clients who want to try smoother hair without committing long-term. Key characteristics of keratin treatments: Offers semi-permanent frizz control and shine. Results typically last 3–6 months, depending on hair type and aftercare. Works best for mildly wavy, frizzy, or dry hair. Doesn’t cause long-term damage when applied professionally with the right product. Great for busy people wanting to reduce blow-drying time or tame seasonal humidity with a natural-looking finish. The Science Behind Nanoplasty Treatments Nanoplasty goes several steps further than keratin by changing the hair's internal structure using nanotechnology and active ingredients like amino acids, collagen, and botanical acids. The nanoplasty treatment not only smooths and straightens hair from within but also offers that dramatic look and longer-lasting results. This permanent hair straightening service is perfect for anyone seeking a noticeable transformation. Safe for pregnant clients and those looking for a non-invasive method, the nanoplasty treatment offers a smooth, effortless experience with no downtime. At our Sunshine Coast salon, we use only natural ingredients, including amino acids, açai, and linseed oil. Plus, after your treatment, you’re free to enjoy hair colouring without any restrictions! Key benefits of Nanoplasty: Offers sleek, straight hair for up to 8–12 months. Suitable for a broader range of hair types, including coarse, curly, and ethnic hair textures. Free from harsh chemicals like formaldehyde. Leaves hair glossy and manageable with less need for heat styling. The effect doesn't wash out because it alters the hair’s inner bonds—it grows out over time. How Long Do the Results Last? Both treatments leave your hair sleek and smooth, but the duration of results varies between services. The best way to choose the right treatment for you is to consider your budget and how often you’re willing to repeat the sessions.
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