Very often the gandar will be open at the bottom, or open at the sides, especially in a Jawa keris. I don't know what the effect of the silica gel might be, if it were to be left in the wrongko. Possibly the result might not be so good.
I leave big bags of silica gel in with some of my keris, I was given these, I didn't go out of my way to buy them, I figure they're probably helpful.
I understand the "no plastic on display" principle. I use plastic all the time on everything, but on the couple of keris I do have on display, there is no plastic visible, I simply pay more attention to these keris, oil them more often, inspect them more often.
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