You will also need an accurate way of measuring water volume. You may use a glass beaker or graduated cylinder ( like those used in a lab ). You can measure exact volumes in milliliters (cc). With a beaker, fill it with water to a certain level exactly (example 100.00 milliliters). Drop in the coin and measure the level of the beaker (example 100.25 ml). Volume of coin is (measurement minus starting volume is coin volume: 100.25-100.00=0.25 ml). This is where you may want to use a syringe instead, to draw off the water and bring the level in the beaker down to 100.00 ml. Read how much water is in the syringe (example: 0.25 ml).
Take the weight in grams and divide by volume in ml and this give you
how much the object weighs per ml. This can give you the density
(g/cc). Silver is much more dense than copper. If you take
a coin that you know is 0,750 silver, you can perform this test and know
how much this alloy weighs per ml. Do this for 0,500 0,600
0,800 0,900 0,950 and 0,975 coins that you know are real. You can
make a chart of the results. Then when you test a coin you can compare
to the chart to see how much silver is in it. You can do the same
for gold, which is even more dense than silver.
Don't over do it. UV light is the part of sunlight that fades things.
Test items only a few times to avoid damage, not really to the item, but
mainly your eyes. Do not do this for more than a few minutes at a
time. Do not look directly at the bulb.
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