G.T. Luscombe Company, Inc. Bible Dry Highlighting Kit | No Bleed Eco-Friendly Refillable Dry Highlighters | No Sharpening | No Smearing or Fading | Yellow, Blue, Pink, Green (Set of 4)

Before you use pens and/or highlighters, test them on a back page where it won't matter. Then you can see if they bleed through. And wait a few days; I've seen gel highlighters change color. Personally, I now only use dry highlighters like these: https://www.amazon.com/dp/B003AHIK7U?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_14 And colored pencils are great for underlining.