This question made me wonder: if you happened to have a scroll with Amaterasu sealed inside, could the seal on this scroll be released thus allowing you to use or spread Amaterasu without having a sharingan?
Such a technique was never used in both anime and manga. However, judging from the way the sealing technique works, I suppose it can be used that way. The evidence for this is Tenten's usage of weaponries.
Tenten stores her weapons in a scroll by putting the said weapons on the open scroll and use a jutsu to seal it into the scroll.
Jiraiya stores the Amaterasu into a scroll too as shown in the question you mentioned.
Thus, as long as you use it within 7 days after its sealing, you can use it as a weapon. Although, to be on the safe side, you better throw the scroll away from you before you release it.
It is not clear whether time passes when being sealed in a paper scroll, thus it is not guaranteed that the scroll will work after the 7 days expiration time of Amaterasu.