Hallo Daniel
1)To clean a rusty blade you can use lemon juice mixed together bi-carb of soda, dish-soap and a little water. Use a toothbrush. Wait for some minutes. After clean the blade with water and repeat until the blade is clean.
2)then you can use warangan. Pay attention: don't use any chimic arsenic ARE DANGEROUS!! You must do like indonesian people: you have to use realgar (natural arsenic stone).
White realgar stone is not good: is good only to kill big rats. Orange-pink china realgar is good.
If you don't have warangan (realgar) you can try to buy realgar in a mineral shop for collectors' stones in your cowntry but is better to have indonesian (china) realgar.
3) then mill warangan like dust (the stone is very powdered). The colour of dust will be rather white. Mixed warangan together some lemon juice (eastern lime or western lemon are the same). 3/4 litre lemon juice for one grams warangam.
4) Wait for a week. Then , during good season, put the blade inside solution and wait for some minutes (turn the blade). After put the blade to dry in the shadow.
PAY ATTENTION: is better you don't have any cuts in your fingers and don't smoke (you can touch the cigarette's filter with fingers wet by warangan)
5) Repeat this until the blade becames black (and nichel remains white or grey). After wash the blade with water and soup and after only with water. If the blade is too black you can use a little lemon juice ogether water
IS VERY IMPORTANT TO DECIDE THE RIGHT MOMENT TO STOP THE PROCESS: WHEN THE BLADE MEET WATER THE BLADE BECAMES MORE DARKER.
6) dry the blade and put oil (If you don't have oil: Ballistol oil is good)
7) good lack
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