When comparing Sparks Hair Dye vs Joico's 'Color Intensity', the Slant community recommends Joico's 'Color Intensity' for most people. In the question“What are the best semi-permanent hair dyes for unnatural colors?” Joico's 'Color Intensity' is ranked 6th while Sparks Hair Dye is ranked 13th.
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Pros
Pro Color stays with correct care
Used to be available in TONS of colors. They are currently rebranding and have only like 5 colors which doesn't work for rainbow-heads like myself.
Pro Washes out nicely
The Electric Blue and Green Ivy/Envy wash out very nicely, you can go 3 months between touch-ups.
Pro Smells amazing
Pro Very vibrant color
I use their red shade and the color that comes out of the tube is very similar to what will come out in your hair.
Pro High end salon results
Pro Helps leave hair gorgeously conditioned + amps up shine
Contains the ultra nourishing Kukui Nut Oil.
Pro Consistency of the dye is easy to work with
Pro You can learn professional techniques from videos on their site
Pro Color stays for a long time
The color will stay lovely and vibrant for weeks on end.
Pro They make metallic colors as well
Pro 2O vibrant intermixable shades last 15 shampoos
When applied using their directions and using Joico's Color Endure or K-Pack Color Therapy shampoo as well as K-Pack Cuticle Sealer and finishing product INtesne Hydrator. You will absolutely see a feel a major difference in the health of your hair.
Pro High quality professional product
Pro Guaranteed healthier hair after every color application
Contains K-PAK’s powerful Quadramine Complex®.
Cons
Con Sometimes can wash out weird and unevenly
Con Fades so fast
Only after one wash green faded to blue.