ok future, I watch the vid. but I want the 5 minutes of my life back from having to watch the vid and the other 5 minutes back also that it took me to write this.....

1. why do you say it is more trouble that it is worth?
b/c you would make them out of either tungsten or copper depending on how much you wanted to deceive the victims. Cu is easiest to do but also easiest to spot.
Obviously the st. petersburg coins were the Cu variant.
2. What are the techniques that would make the shown minted coins easily detected?
METALLURGICAL
a. Au is the softest most ductile metal, it should flatten out like a pancake real easy if I hit it with a hammer
b. mohs hardness test, will reveal just by rubbing or scratching it if it is gold
c. ductility, see a., it will bend immediately in your hands
d. density, divide the weight by the volume to see if it corresponds
e. xrays, tungsten will bounce back xrays like crazy
CHEMICAL
a. is only attacked by one acid, put a drop of hydrochloric acid on it and heat, if Cu it will turn blue/green , gold will not be affected.
b. again put a drop of nitric acid on it, if Cu if will start giving off brown fumes and turn blue, gold will not be affected.
c. dissolve it in aqua regia, nitric and hydrochloric acids mixture, if it has any hint of blue , its got Cu.