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Normally the fossils are found with rests of clay or other things, another incrusted rocks, etc..., so it is neccesay to prepare them.

It is advisable to know the kind of rock where it has been fossilized. If it is limestone, be careful with corrosive acids because they damage it fastly. If it is siliceous, it is less sensitive.
As the first step, dissolve a small quantity of sulphuric acid in water. Be careful with concentration, because you can lose the fossil (it happens once to me: I lost a beautiful sample of hemicidaris)
In a while, take the fossil away from the solution, using rubber golves, and with an esparto brush and clean water, brush the susface until it is well cleaned.

For the incrustred rocks, it is neccesary to use mechanical tools. A small chisel and a small hammer, for starting; some thin and resistent needles...
I use an electrical mini-drill, one of those which can be regulated between 0 y 30.000 rpm., with different tools, like milling cutters, grinding discs, metallic brush, etc... as my main tool.
If the fossil is incrustred in a rock and you foresee it will be impossible to take it away from there, the best is to cut the rock in a regular shape that will serve as a base . For that, I use an electrical cutting machine with a disc of 125 mm. for stone . Later on, with a polish disc, I polish all the sides the best as possible, and the result is excellent.

Afterwards, the numbering, filling the file and inserting in the collection.




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