How long does it last?

For me it lasted vividly for about 10 washes then faded to a pale green which will stay in your hair until the end of time.

will it dye light brown/dark blonde hair?

Nope. I recommend crazy color hair dye for that.

Are the dyes vegan? I’ve seen they’re not tested on animals but do they contain any animal derivatives?

From Stargazer website: " Is our Range Vegan friendly? We have recently (early 2015) had an assessor look at which one of our products we could note as being Vegan. The results showed that due to Lanolin and Beeswax that none of our products are vegan. After this we instructed our manufacturing branch (Star Colour Laboratories), to manufacture our products to be vegan friendly. However this will take a very long time for us to say our products are actually vegan as we sell through the old model." As far as I can tell from the ingredients list on my bottles, there's no lanolin or beeswax listed, but I'm not personally going to guarantee their vegan. However, they don't test on animals or sell to China, which is a good sign ;)

Can you use this as a shampoo on already dyed hair to extend the life of the dye?

Stargazer dyes are very conditioning - you would be better to shampoo as normal and then use it as a conditioner - leave for 5-15 minutes.

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Stargazer Royal Blue Semi Permanent Hair Dye

Product ID: 49140195

Details

Brand
Stargazer
Colour
Royal Blue
Hair type
All
Item form
Liquid
Material Type Free
Ammonia Free
Material feature
Gentle Less

🌱Vegan & cruelty-free UK-made formula

🔵Vibrant royal blue lasting up to 15 washes

🧤Gloves included for mess-free application

Description

🔷 Own the room with fearless, fade-resistant royal blue vibes!

ETHICAL ICONIC - 25+ years of trusted UK-made, vegan, and cruelty-free hair color innovation.
BOLD LONG LASTING - Up to 15 washes on pre-lightened hair for a statement look that won’t quit.
GENTLE YET POWERFUL - Ammonia & peroxide-free formula conditions hair while delivering vivid color.
MIX MATCH YOUR MOOD - Create custom shades by blending Stargazer colors—stand out your way.
EFFORTLESS APPLICATION - Includes gloves and a precision tip bottle for clean, easy coverage.

Stargazer Royal Blue Semi Permanent Hair Dye offers a vibrant, ammonia- and peroxide-free formula that delivers intense royal blue color lasting up to 15 washes on pre-lightened hair. This vegan, cruelty-free UK-made dye includes gloves for easy application and can be mixed with other Stargazer shades to customize your look. Perfect for millennials seeking bold, ethical, and high-impact hair color without long-term commitment.

Specifications

ASIN	B0025T2QDS
ASIN	B0025T2QDS
Benefits	Vibrant Color, Conditions, Easy to Use
Best Sellers Rank	53,799 in Beauty ( See Top 100 in Beauty ) 344 in Semi-Permanent Hair Colour
Brand Name	Stargazer
Colour	Royal Blue
Container Type	Bottle
Customer Reviews	4.2 4.2 out of 5 stars (946)
Customer reviews	4.2 4.2 out of 5 stars (946)
Full Cure Time	30 Minutes
Global Trade Identification Number	05036469001109
Guaranteed software updates until	unknown
Hair Color Permanence	Semi-Permanent
Hair Type	All
Is discontinued by manufacturer	No
Item Form	Liquid
Item model number	5036469001109
Manufacturer	Stargazer
Manufacturer	Stargazer
Manufacturer Part Number	SGS110-ROYAL BLUE
Material Features	Gentle, Less Damaging
Material Type Free	Ammonia Free
Model Number	5036469001109
Number of Items	1
Package Size Name	pack of 1
Product Dimensions	3.8 x 3.8 x 13.5 cm; 90 g
Recommended Uses For Product	Hair coloring
Set Name	Single Application
Suitable Hair Colour	Blue
UPC	798525603898
Unit Count	70.0 millilitre

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