this video just blew my mind 
:
i have searched how to make this stuff, and its a very tricky chemical process. very hard to make at home.
but after some more research i find this whole component on alyexpress 
https://nl.aliexpress.com/item/1005002006424655.html?spm=a2g0o.search0302.0.0.414b5d7a8O4BAe&algo_pvid=c0c32f7c-5add-47b4-8cd7-d9296b0bf98e&algo_expid=c0c32f7c-5add-47b4-8cd7-d9296b0bf98e-1&btsid=2100bdd816208450757865488e6987&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
…going to order it and hack it to work with op-z !
(probably, array of electro magnets behind it, triggered by cv, cant wait 
)