In Jain Dharma there is no separate big “shastra” only on pen or ink, but their use comes under the general rules of:

• Ahimsā (non‑violence)
• Aparigraha (non‑possessiveness)
• Shauch / saiyam (cleanliness and discipline)

So, simple Jain‑based rules for using pen and ink:

1. Do not use pen for himsā through words

- Do not write abusive, insulting, violent, or false things. - Pen should be used for satya (truth), punya (good work), study, helping others.

1. Avoid unnecessary waste

- Don’t scribble and throw pages for no reason. - Finish a notebook/pen fully before buying many more – this follows aparigraha (simple living).

1. Care for living beings

- Do not throw ink, refills, or pens in places where insects or small beings live (wet corners, plants, open drains). - Close caps properly so ink does not leak and mix with food/water used by living beings.

1. Purity near religious items

- When doing Pāṭh, Pūjā, Samayik, or Pratikraman, avoid keeping leaky pens or ink bottles on scriptures, cūrṇi, or near mūrtis. - If you need to note something religious, keep the place clean and dry.

1. Choice of pen/ink (if you want to be more careful)

- Prefer simple, long‑lasting pens (less plastic waste). - If possible, choose inks that are water‑based / plant‑based and avoid those known to use animal products (this is a higher, optional level of care).

1. For students / office use

- Using pen/ink for study, office work, exams etc. is fully allowed in Jainism. - Just remember: honesty in what you write (no cheating, no lying) is more important than which pen you use.

Digambar / Śvetāmbara note

• For laypeople (śrāvaks/śrāvikās), both traditions follow the same basic ideas above.
• For monks, there are stricter rules: many traditional saints avoid modern pens and use very limited writing only when necessary, but that standard is not required from householders.

In short: Jain Dharma does not forbid pen or ink. It teaches us to use them with truth, non‑violence, and simplicity.