What you're looking for is clear resin - unfortunately as resin setting is a chemical reaction, most resins give off heat to some degree (some more than others so might be able to get away with it) - if you want to cast something in clear resin you will need a more durable mould
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~The ravings of a single mad Goblin is bad enough, but such a power-hungry, malice-filled creature as Mortis can never hope to be understood~