How to indentified blade No.1 on A320 CFM-56 5B Engine

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About this video

if you watch video already let me give you a few more informations about the front section of the engine.

Spinner Front Cone
The spinner front cone is made of composite material. Its design precludes the need for an engine nose anti-icing system. The front cone is bolted to the rear cone.

Spinner Rear Cone
The spinner rear cone is made of aluminum alloy. Its rear flange is bolted to the fan disk and is part of the fan blades retention system.
The outer rim of rear flange is provided with tapped holes for trim balance bolts. The front flange provides for attachment of the spinner front cone.

Fan Disk
The fan disk is a titanium alloy forging. Its inner rear flange provides attachment for the fan shaft and its outer rear flange is bolted to the booster rotor. The outer front flange provides attachment for the spinner rear cone. The disk outer rim has 36 recesses designed for fan blade retention.

Fan Blades
There are 36 titanium alloy, mid-span shrouded fan blades approximately 23 in. (0.58 m) long. Each of the blades has a dovetail base that engages in disk rim recess.
Blades are individually retained by a spacer that limits radial movement.
A retainer lug, machined at the rear en