Aluminum or Silver

[matthewc61]

Found item 1890 - 1920 homestead
Research found that it was an aluminum hinged lid, yet it bench testing
Was range 95+. Other aluminum items are testing
in the range 75 - 84. Aluminum foil test at 40ish
Which seems more in line.
Could the item at 95+ be truly silver, or is my Garrett Ace 400
out of calibration?

 

[cudamark]

When it comes to I.D. numbers, size matters. Aluminum can read from just above iron to the end of the silver scale....unfortunately. The larger/thicker the chunk is, the higher it will read.

 

[matthewc61]

Thanks Cudamark for the clarification.