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https://en.wikipedia.org/wiki/Curing_salt
Curing salt is 6.25% sodium nitrite (not nitrAte) and 93.75% sodium chloride (regular salt-iodine free)
It is a 1:16 ratio so 1 ounce of sodium nitrite to 16 ounces of salt. so that is what I recommend you acquire. This will be enough cure #1 for 425# of meat.
For 25# of meat, you will need one ounce of your cure #1 mix.
You can use beet color powder to give you the pink tint to the mixture....
Let's check this out....
Cure#1's generally accepted usage is ~1.1 grams per pound of meat....
Salt's generally acceptable level is ~ 8 grams per pound of meat for a 1.7% level....
Do yourself a favor and add grey salt to the meat along with cure#1.....