Or simply have both. Not two different gunpowder types, just two different recipes to make gunpowder.
Have each require their own patent, and one require the other. That way it is an upgraded more advanced recipe unlocked by researching a second patent.
Special perquisites can be added to the advanced recipe patent, such as electricity or plastic tools.
Off-topic: I have wanted large missiles that use grav-couples forever too.
Have each require their own patent, and one require the other. That way it is an upgraded more advanced recipe unlocked by researching a second patent.
Special perquisites can be added to the advanced recipe patent, such as electricity or plastic tools.
Off-topic: I have wanted large missiles that use grav-couples forever too.