Bubble tip anemones are rarely dyed as their natural color is bright enough. Usually anemones that are dyed have a base color that is white/grey. The most common color used to dye anemones is yellow. Bright yellow anemones are almost certainly dyed.
Pink pigments are natural for some anemones like bubble-tip anemones. However bright pink is not a natural color for leather corals and other common soft corals that are photosynthetic. Pink can be a natural color if the coral is non-photosynthetic. Basically if you see a photosynthetic soft coral that is bright yellow or deep/bright pink, be very skeptical.
If you want to see examples, go to one of the largest marine farms in the north. Tanks and tanks of dyed corals. In the east side as well.