The acrylic two way mirror can be installed in either direction, so it can pass the fingernail test. Therefore, you will need other methods to detect a two way mirror.
How to Tell if a Mirror Is Two Way or Not: 8 Steps (with Pictures)
How To Detect A Two Way Mirror [Fingernail Test]
BORN PRETTY Chrome Powder,Metallic Mirror Pearl
fingernail-test-comparison-between-standard-mirror-and-acrylic-two-way-mirror
How to Tell if a Mirror Is Two Way or Not: 8 Steps (with Pictures)
gLoaSublim Nail Polish 6ml Metallic Chrome Mirror
Some Life Saving Trial Room Hacks Every Girl Should Know
Glass Two Way Mirror, In Stock, Custom Sizes
Ochine New Mirror Gel Nail Polish 18 ML Non
6 วิธีป้องกันการแอบถ่ายและขโมยข้อมูลเวลาไปเที่ยว - BACIDEA
News - Difference Between Acrylic Mirror, Double-Sided Mirror, and
fingernail-test-comparison-between-standard-mirror-and-acrylic-two
How To Detect A Two Way Mirror [Fingernail Test]
Some Life Saving Trial Room Hacks Every Girl Should Know