2 Copper Dust+2 Silver Dust+4 Redstone==Smelter==>288L Molten Copper + 288L Molten Silver + 576L Molten Redstone ==Mixer==> 1152L Molten Signalum
1152L Molten Signalum ==Centrifuge==> 1 Copper Dust + 2 Silver Dust + 5 Red Alloy Dust
5 Red Alloy Dust ==Smelter==> 720L Molten Red Alloy ==Centrifuge==>5 Copper Dust + 25 Redstone

Total:
2 Copper Dust+2 Silver Dust+4 Redstone==>6 Copper Dust + 2 Silver Dust + 25 Redstone