My family has a 1965 E-Type Roadster show car and we want to change to synthetic fluid but yet still have it look like we have original fluid in the bottle...anyone have any ideas?

 

What fluid color? Is it still using Castrol Crimson (I'm assuming it's a Girling system). If so, I don't think its available anymore. Castrol LMA is the current fluid of that lineage and it's clear (and DOT 3 non synthetic). If your braking system hasn't had a complete overhaul, synthetic fluid would probably not be a good idea in the first place.