P.S. You can use https://www.bitaddress.org/ to create paper wallet. Don't do it online. Download webpage(.zip file) and then generate private keys from an offline computer and print it.
I see. Question, can i use mycelium to generate address and get the private key, write it on paper and delete the address and key from mycelium?
No. AFAIK Mycelium is HD wallet and it does not have any option to export private keys of certain addresses. You can only export master public key(MPK) or master private key(MPR aka seed).
no you are wrong, i can get private key on mycelium i think it is on updated Mycelium wallet app
I checked and I found you can't export private key per address basis in HD account. You maybe talking about imported addresses. CMIIW.