Is it appropriate to ask priests to bless things like oil, salt and water that you bring to them for a blessing? I was reading [this answer](https://christianity.stackexchange.com/a/78215/4) and was wondering if it made sense for a layperson to bring things like salt and oil for a blessing. Would a priest be responsible for making sure that the thing they're blessing really _is_ salt, oil and water?

Say that a person had a container with holy water and the water within it froze. Would that frozen holy water still retain its blessing and be efficacious in protecting against evil, be able to be used in baptism, etc?

My question is kind of similar to [this one](https://christianity.stackexchange.com/questions/48657/how-should-must-catholics-handle-transport-and-use-holy-water) , but more specific. There's a lot of conflicting information on the internet regarding diluting the holy water. Some people suggest that the water must be comprised of more than 50% originally blessed water to be considered "holy". None of the sources seemed to suggest that it is "50% holy" then, though; to the contrary, "holiness" of the water is supposed to be a boolean property. This would imply that holy water obtained by 50-50 dilution and contact with originally blessed holy water is different to the originally blessed holy water. Specifically, that all the properties of the original water are kept, *except* the ability to be diluted with non-blessed water. This is my understanding basing on some public findings though; I was struggling to find any real canonical source that would definitely answer all of my questions.

I noticed that Catholics dip their fingers in Holy Water kept mostly at the entrance to the Church and apply it on their forehead. What is Holy Water? Is there any specific liquid/water for it? What are the uses of Holy Water?