Some of James Montier’s recent investment insights:
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An essentially identical procedure called "silver staining" is utilized in molecular biology to visualize DNA or proteins after gel electrophoresis , usually SDS-PAGE . The latent image is formed by the DNA or protein molecules (. the reduced silver selectively precipitates onto those molecules). It is known for being nearly as sensitive as autoradiography , the "gold standard" technique, but one not widely used due to the use of radioactive materials. 
A lot of the above article is pure nonsense. The paper spot price of Gold is the Price you pay per Oz for actual bullion PLUS the cost of fabricating the Bar or coin. Coins can be a ridiculous 10% + more than the per Oz rate & for large purchases are a really expensive way to hold Gold.