Removing Crack in Granite Kitchen Sink: Effective Sealing, Gluing, & Fixing Methods with Photos

To the Second Year!
Hello, I would like to ask you for help in removing a crack in a granite kitchen sink. Some time ago I noticed a scratch which became more visible after some time due to discoloration. Therefore, now I can see that it is along its entire length, from the edge to the siphon. At the beginning, single drops of water appeared in the cupboard under the sink, now it drips with every wash. Does any of your colleagues know how to seal, glue or fix it?
Below are photos of this feature.

Please try to cover the scratch underneath with the colorless SOUDAL sealant after degreasing the surface with acetone or nitro solvent.

And can I also seal it from the top? Is the preparation in question sold in such quantities that I do not have to buy a bucket of this drug?

Such a little thing to start with:
google and the slogan "repairing a cracked sink". "Granite" or "stone" will add itself. This is not the first malfunction of this type.
There are epoxy adhesives, there are resins. But I do not know if such a crack, especially since it is already soaked with dirty and greasy water, can still be stuck to it.
There is also such a material, synthetic granite - corian. Maybe chemistry can do something for him.
Sticking and patching this crack only on the underside is a misunderstanding and will not do anything.
The worst part is that this crack can grow larger, e.g. under the influence of temperature.

Can anyone recommend a resin to fill a crack in a Franke sink made of a material called Fragranit?
It would be nice if the resin was so thin that it poured in from the top and reached the bottom.