Differences between Silk & Mink (faux) lashes – both are made from synthetic fibres known as PBT (Polybutylene Terephthalate, ie a thermoplastic polymer/polyester).
The differences between the two are their finishings.
Mink is less tapered towards the tip, therefore gives a fuller look. Being less tapered also makes it look similar to real mink, hence the name.
Silk is more tapered – tapering starts from near the base all the way to the tip. This makes it “softer” and therefore lighter compared to the mink counterpart. This is also why “silk” lashes don’t come in width less than 0.1 (because there’s nothing left to taper!)
Depending on the manufacturer/brand, the above may be reversed. This goes with the shine as well. “Generally”, mink is more glossy than silk, but some manufacturers make the opposite (just to keep you on your toes 😛 ). So always check the descriptions when switching brands (or even type) to make sure you get what you’re expecting…
From the same brand – a Silk tray is usually a dollar or two more expensive compared to mink because of the extra processing required.
0.07mm or thinner lashes are often incorrectly labeled as “silk” just because they’re “soft”. This softness is a result of their lack of thickness, not from the tapering. 0.07’s (or thinner) tapering is more like faux mink as mentioned above.
Bonus trivia – PBT is used as an insulator in the electrical and electronic industries. It is resistant to solvents and shrinkage; is strong and heat resistant (to 150°C). These properties are what make it ideal to produce lashes from – strong and hold their curls for longer than real mink or hair.