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Aluminum wiring to tinned copper

I am installing a new dimmer switch in my basement but the existing wire running to the switch is aluminum.

I'm using AL/CU wire nuts to make the connection. I noticed the copper wires coming from the dimmer switch are tin coated. Is there any issue with using a normal AL/CU wire cap even though the copper is tinned?

The wire nutsĀ I'm using are made by Ideal. Purple caps with corrosion gel inside.

Thanks in advance!

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