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Gold colour and karat

 

colour   karat   finegold%   finesilver%   copper%   zinc%   nickel%
yellow   9.5   39.60   12.08   42.28   6.04   --
    13.5   56.25   8.75   30.65   4.35   --
    14.   58.33   8.31   29.19   4.17   --
    18.   75.00   15.00   10.00   --   --
white   9.5   39.60   --   34.00   8.70   17.70
    13.5   56.25   --   24.63   6.30   12.82
    14.   58.33   --   23.47   5.99   12.21
    18.   75.00   --   2.23   5.47   17.30
green   13.5   56.25   36.70   6.80   .25   --
red   13.5   56.25   2.20   41.55   --   --
 
To 995 karat  1 gr. fine gold 0.32666 alloy added
  fine gold fine silver copper
pink 1 gr 0.110 0.223
red 1 gr 0.050 0.283

 

 

 

To lower the gold karat:

 

            G (K - W)

A= 

                   W

 

A =  the alloy weight we will add to lower the karat

G = weight of fine gold

W = the karat we want to get  

K = karat of gold in hand

 

For example: We have 70 gr 24 karat of gold. We want to lower the karat to 14 karat.  

            70 ( 24 – 14 )            70( 10 )            700

A =     =    =    =  50

                   14                         14                 14

 

We add 50 gr. alloy to 70 gr fine gold we get 120 gr. 14 karat gold.

 

To raise the karat of gold:

           S ( KW _ KS )

FG =

               24 – KW

 

FG =  fine gold

KS = karat of scrap gold

KW = the karat we want to get

S = weight of scrap gold

 

For example: We have 20 gr. 10 karat gold. We want to increase the karat to 14.  

How much gold we should add?   

             20 ( 14 – 10 )          20 ( 4  )          80

FG =    =    =  = 8

                24 – 14                    10               10

 

If we add 8 gr. fine gold to 20 gr 10 karat gold we get 28 gr. 14 karat gold.