i am writing this procedure as i was told but i need some explanation [if any]
ASSAYING KARAT GOLD
1.drill sample from bullion,
2.make three sub-sample of gold 0.25000 gramin in weight
3.add 0.32000gram pure silver
4.foil in lead
5.put in cupell, and cupell in furnance at 960grade Celcius which forms a button contaning only Gold and Silver
6.roll the button to for a sheet,
6.boil with nitric acid in 32 baume 1 time for 20minutes
7.boil with nitric acid in 49 baume 2 times for 20minutes
8.wash with distilled water, and let dry
9.measure the left over of the gold and divide /primary sample
[for example leftover=0.15203 divide by 0.25000 =0.608‰
that means 608/1000 pureness
ASSAYING FINE GOLD
1.drill sample from bullion,
2.make three sub-sample of gold 0.25000 gramin in weight
3.add 0.45000gram pure silver and 0.05000gram Copper
4.foil in lead
5.put in cupell, and cupell in furnance at 960grade Celcius which forms a button contaning only Gold and Silver
6.roll the button to for a sheet,
6.boil with nitric acid in 32 baume 1 time for 20minutes
7.boil with nitric acid in 49 baume 3 times for 20minutes
8.wash with distilled water, and let dry
9.measure the left over of the gold and divide /primary sample
[for example leftover=0.24239 divide by 0.25000 =0.96956‰
that means 969/1000 pureness
why is that i use for assay of karat gold 0.25gram Gold and 0.32gr silver
while for FINE GOLD 0.25gram gold + 0.32 silver + 0.05 Copper
ASSAYING KARAT GOLD
1.drill sample from bullion,
2.make three sub-sample of gold 0.25000 gramin in weight
3.add 0.32000gram pure silver
4.foil in lead
5.put in cupell, and cupell in furnance at 960grade Celcius which forms a button contaning only Gold and Silver
6.roll the button to for a sheet,
6.boil with nitric acid in 32 baume 1 time for 20minutes
7.boil with nitric acid in 49 baume 2 times for 20minutes
8.wash with distilled water, and let dry
9.measure the left over of the gold and divide /primary sample
[for example leftover=0.15203 divide by 0.25000 =0.608‰
that means 608/1000 pureness
ASSAYING FINE GOLD
1.drill sample from bullion,
2.make three sub-sample of gold 0.25000 gramin in weight
3.add 0.45000gram pure silver and 0.05000gram Copper
4.foil in lead
5.put in cupell, and cupell in furnance at 960grade Celcius which forms a button contaning only Gold and Silver
6.roll the button to for a sheet,
6.boil with nitric acid in 32 baume 1 time for 20minutes
7.boil with nitric acid in 49 baume 3 times for 20minutes
8.wash with distilled water, and let dry
9.measure the left over of the gold and divide /primary sample
[for example leftover=0.24239 divide by 0.25000 =0.96956‰
that means 969/1000 pureness
why is that i use for assay of karat gold 0.25gram Gold and 0.32gr silver
while for FINE GOLD 0.25gram gold + 0.32 silver + 0.05 Copper