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There's a great variety of finishes in this palette, from matte to sparkly, metallic to satin finishes! If you can swatch the Full Spectrum palette in store, make sure to try several colors (to get a better feel of the different formulas) because the texture and finish varies quite a bit for each shade.
While most of the shades don't really need an eyeshadow primer (they are very pigmented!), I still prefer to use one to prevent creasing and intensify the colors.
Out of the 21 shades, only 3 of them were too sheer or dusty for my liking. Metamorphosis, Faded and Midnight Blaze needed to be applied over an eyeshadow primer and a few layers are required to obtain the desired intensity, but despite all that they weren't as pigmented as the other shades.
Unless these were the shades you were looking forward the most, I don't think this is a deal breaker. I mean, I can make these 3 shades work but the formula could be better. Overall, I really adored this palette!
By the way, this palette is equipped with a large mirror and comes with a double-ended brush. The Shadow Brush is great to pack color on the lids and I use the Tapered Crease Brush to blend the eyeshadows.
I rarely wear bright colors so I know I won't reach for this palette often, but I don't have any dupes for at least half of these shades so I will definitely keep it in my makeup collection!
Alchemy is a plummy pink with a shimmery finish.
Warning is a copper with a metallic finish.
Midnight Blaze is a dark grey with gold micro-glitters.
Hundred is a deep forest green with a shimmery finish.
Minx is a deep navy blue with a subtle sparkly finish.
Delirious is a matte plum with a very subtle shimmery finish.
Platonic is a charcoal grey with micro-glitters.
Gossip is a hot pink with a soft shimmery finish and some random silver micro-glitters.
Seize is a bright corail with a satin finish and some random silver micro-glitters.
Calavera is a matte vibrant yellow with a shimmery finish.
Hatter is a matte bright green with a subtle shimmery finish.
Blindsided is a matte bright blue with a slightly shimmery finish.
Sketch is a medium purple with a shimmery finish.
Iced is a light silver with a glittery finish.
Paranoia is a cool-toned pink with a shimmery finish.
Jones is a shimmery orange with a few random silver micro-glitters.
Goldmine is a yellow-gold with a sparkly finish.
Mean is a golden lime green with a shimmery finish.
Metamorphosis is a matte periwinkle blue with subtle shimmers.
Faded is a matte lavender with gold micro-glitters.
Bump is a white with a matte finish.
(I received this product in order to evaluate it and give my opinion, but rest assured that my comments are always honest and impartial.)