Yes, but there aren't any pink card reader in zone 1. If you go onto the single fare finder and put in two stations, it will tell you the price of the journey, then the price avoiding zone 1 and tell you where to touch the card reader . I can travel from Heathrow to Upminster, 60 miles by road, for £1.50 but it tells me to change at Gunnersbury and Stratrofd and touch the pink card readers there. I could, if I wanted, travel right through zone 1 as long as I touch those card readers along the way. But it would make the journey longer overall so what's the point in doing that?
So can you simply just go through zone 1 and touch the pink Oyster?
You have to touch pink card readers to say you haven't.
How do they know if you had gone through zone 1? What if I got to zone 2 without entering zone 1
£1.50 Single fare applies to Zone 2 to 6 within TFL Services. National Rail station fares might vary. Please use the link below to calculate fares: https://tfl.gov.uk/fares-and-payments/fares/single-fare-finder