Impurities

Q: Is it permissible to tan elephant skin?

Q: I am currently abroad and I have been doubting everything recently. I was recently told that theres a potential of lard (pig fat) being used in the making of bread here in some of the bakeries. My friends eat that bread because they are non Muslims.

My question is, if they were to eat the bread which is a dry entity and then touch me with it after they are done, would I become najis, or does impurity only travel through wetness? 

Q: I had an infection on my toe which I washed off (whatever was coming out of the infection) in the tub. A little later, while the tub was still wet, I was making wudu in the tub and some water splashed back to me when I washed my face. Was this water impure? Also, when I am filling up a jug to use to make istinja, I sometimes place my finger in the water to check how warm it is. Does this affect the ability of the water to purify?

Q: I read in Bahisti Zewar under miscellaneous masa'il that if a person uproots his hair, then the root of that hair is regarded as impure because of the stickyness that is found on it.

1. Does this mean that if you uproot a hair anywhere on your body then the root of that hair is impure?

2. If you touch the root of the hair then will your fingers also get impure and do you have to wash your fingers and make wudhu?

3. If you uproot a hair and you touch it but you feel no stickyness then will your fingers become impure?

4. Sometimes I pull at my sideburns and a hair comes out and it is yellowish in colour at the root but when I touch it there is no stickyness on it. Is the root of that hair impure and did my fingers become impure?

Q: If wet semen or sperm is present on clothes and it dries after a while, would the garment be clean after scraping it off?

Q: What is the ruling on touching ethyl alcohol which is used in labs for making slides? I have a pathology class in which we have to use alcohol. Should I wash my hands after touching alcohol bottles even if they are dry?

Q: During the day, when I kiss and love my wife, one or two thick drops discharge from my penis. Is it compulsory for me to take a bath or not?

Q: My mother washed one of my impure dresses along with other dresses as it was wet in the rain and had mud over them. I didn't know about her washing the dresses, so I wore one of those dress and prayed. Do I have to repeat the salah? She did not use soap.

Q: Does a leather sandal become pure by just being rinsed under a tap? (It was messed with urine and impure water). 

Q: Yesterday I found a piece of toilet paper with stool on the shower floor, my concern is that my family had showered in there and while I am not certain if they specifically stepped on the toilet paper, since the entire floor within the shower is wet, I would like to know if this makes the whole shower floor napaak thereby making their feet (as they are barefoot in the shower) and all the surfaces their feet touched napaak as well.