

After Sosuke Aizen, Gin Ichimaru and Kaname Tousen reveal themselves near to
the end of Season 11, Shinji Hirako and the other Soul Reapers who later
become the Vizards suddenly start to Hollowfy.

At first I thought that because the last thing we saw of Kensei Muguruma
before he Hollowfied was that he was stabbed by Kaname Tousen using his
Zanpakuto's release, I thought that maybe Kaname did something to Kensei and
Mashiro Kuna. However when Aizen turned up and the team starts to Hollowfy
before Kaname turned up. Also Hiyori Sarugaki was for the most part being held
by Shinji and there was no indication that she had a run in with Kaname as she
was fighting Kensei and she Hollowfied while Shinji was holding her.

So I am wondering how did Aizen start the Holllowfication on Shinji's team?


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bleach
How did Aizen start the Holllowfication on Shinji's team?


We don't really know what created the Hollowfication process. To quote from
[Wikia](http://bleach.wikia.com/wiki/Hollowfication#Unknown_Infection):

> It is unclear how the other Visored gained their current status. What is
> known is Sōsuke Aizen was instrumental in the Hollowfication process, though
> whether he knew of the full potential of the results is left to be
> questioned. The process used seems to spread as some form of possible
> infection through wounds which has the desired effects on souls with high-
> level Reiryoku, as compared to souls with low-level Reiryoku. The infected
> experience great sickness and fatigue, eventually vomiting up Reishi in the
> form of a white liquid, which forms the beginnings of their Hollow mask
> before proceeding to transform their bodies and warp their minds. Other than
> that, all that is known is the process is accelerated by increased stress.
> The conclusive result makes a Shinigami into a primarily Hollow-like
> humanoid, which is a highly unstable transformation causing mindlessness and
> aggression.

It should be noted that all members of the Visored except Shinji and Hiyori
were cut by Tousen, and Hiyori was wounded by Hollowfied Kensei and Shinji was
cut by Hollowfied Hiyori, so Wikia's claim that the Hollowfication process is
probably caused by infection through wounds is sound.

However, it is almost certain that the source of the Hollowfication process is
the [Hougyoku](http://bleach.wikia.com/wiki/H%C5%8Dgyoku#Powers):

> **Hollowfication/Arrancarification** : While not truly an ability of the
> Hōgyoku itself, the orb took on this property because it is what Kisuke
> Urahara desired when he invented it. Through this power, the Hōgyoku could
> be used to bypass the barrier which separates Shinigami and Hollows. As
> such, it can cause Shinigami to undergo Hollowfication and Hollows to
> undergo Arrancarification. These processes lead to the creation of a Hollow-
> Shinigami hybrid and an Arrancar, respectively.


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