If you want to see a merge chain of an item on the merge field, you can tap on that item, and then tap the button in the upper right corner  , There you can also see a Generator that it comes from.
 
Here's the list of currently available merge chains in the game:

  • Regular items

1. Key 
>>>>.
 
2. Scroll
> > >> >>> > >.
 
3. Tools
 >  >>>>>>>>>>.
 

4. Rope

>>>>>.

 

5. Food

  > >> > > >>>.

 

6. Drinks

 >>>>>>.

 

7. Amulet

> >>>> >>>>.

8. Garden Tools

 >>>> >>>>>>>.

9. Navigation Tools

>>>> > >  > > > .

10. Magic Plant

> > > > > > > .

11.  Painting Tools

> > > > > > > .

12. Alchemistry

> > > > >  > .

13. Fragments

> > > > > > > .

14. Ships

> > > > > > > > > .

  • Generators

1. For keys and scrolls

> > > > > > > > >.

2. For food and drinks

> > > > > > > > > .


3. For tools and rope

 > >> > > > > > > .

 4. For amulets and potions

> > > > > > > > > .

5. For gardening and painting tools

> > > > > > > > > .

6. For navigation tools and ships

>> > > >  > > >> .

7. For potions and magic plants
 > > > > > >  > > >.

8. For painting tools
 > > > > > .