Why Colors Doesn't Change Obviously? 
<br />That's because the environment temperature is relatively constant, so the color isn't changed during this period. You could try to put you fingers into warm water and then cool water to check the obvious colors changing.
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<br />Feature:
<br />Brand New: Modelones
<br />Ingredient: Resin 
<br />Type: Soak-off UV Gel Polish
<br />Color: 25 colors
<br />Volume: 10 ml
<br />Effect: Color-Changing with temperature
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<br />Package list: 
<br />Temperature gel * 1
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<br />Professional usage:
<br />Step 1. Clean Nails then trim nail surface as normal manicure process. 
<br />Step 2. Fully shake up the polish, it can make the polish color be balanced. (Important)
<br />Step 3.Apply Base coat first, which can make polish lasting longer, cure with UV lamp or LED lamp. (Necessary)
<br />Step 4. Apply polish directly, cure with UV lamp for 2-3 minutes or cure with LED lamp for 60 second; 
<br />when dry, apply the 2nd layer and cure with UV lamp or LED lamp again.
<br />Step 5. Coat with removable topcoat, which can make color more shining, then cured by UV lamp or LED lamp.
<br />Step 6. Remove the tacky surface with cotton soaked with cleanser.
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<br />HOW TO REMOVER:
<br />1. Soak off the nails into acrylic remover for about 5 minutes.
<br />2. Rip down the whole piece of nail enamel gently on each nail.