RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: Super Defense Potion Certificate

A Super Defense Potion Certificate is a certificate that is obtained by exchanging five super Defense potions with Sidney Smith in Yanille. Super Defense potion certificates are stackable and each one can be exchanged back for five super Defense potions by talking to Sidney Smith.

Because super defense potions are not stackable and players can only trade twelve items per trade screen, they are often exchanged for certificates so that they can be traded easier and faster.

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