The Secret Science of Covert Inks Samuel Rubin This book presents a comprehensive guide to the many forms of invisible inks used in espionage, conjuring, and communicating secret messages. Includes recipes and a chapter on covert pens. An example recipe: 'Chinese Red Secret Ink'. Used by agents of the Chinese Ministry of Public Security, this ink is made by mixing one part each of phenolphthalein, glycerin, alcohol…

Channel
Berserker Books
@berserkerbooks
On this record: Growth · Engagement · Reactions · Posts · Citations · Cite this entry
295subscribers
+3 since we began measuring on 6 August 2026
Risers and fallers across the register · movement among entries of Under 1,000.
Register entry
| Telegram ID | -1002132724607 |
|---|---|
| Type | Channel |
| Username | @berserkerbooks |
| Created | Between 1 November 2023 and 31 May 2024 — estimated from Telegram’s id allocation, not measured. How this range is calculated. |
| First recorded | 6 August 2026 |
| Last confirmed live | 6 September 2026 |
| Measurements held | 6 |
| Confirmed unchanged | 1 time, most recently 6 September 2026 |
| On Telegram | t.me/berserkerbooks |
Growth
| Measured (UTC) | Subscribers | Change |
|---|---|---|
| 6 Sept 2026, 10:40 | 295 | +5 |
| 29 Aug 2026, 03:28 | 290 | -1 |
| 22 Aug 2026, 19:54 | 291 | +1 |
| 15 Aug 2026, 20:12 | 290 | -2 |
| 6 Aug 2026, 22:48 | 292 | no change |
| 6 Aug 2026, 19:47 | 292 | first reading |
Engagement
20 posts held, back to 19 July 2026 — the reader has not yet reached the start of this channel’s public history, so older posts may sit further back, unread. Read across 1 page of Telegram’s post history, 20 posts per page.
Nothing published in the last 30 days. ERR and ER are rolling 30-day measures, so there is nothing to compute — we hold 20 posts for this entry, the most recent from 6 August 2026. An engagement rate over an empty window would be a number about nothing.
Reaction mix
3 reactions across 2 posts, in 1 kind.
| Reaction | Count | Share | Share, drawn |
|---|---|---|---|
| ❤ | 3 | 100.0% |
No sentiment is inferred, and none should be read in. This table is ordered by count and by nothing else. Emoji do not carry stable meaning across languages or communities — 🙏 is thanks in one channel and mourning in another — so we publish which ones were pressed and how often, and pass no judgement on what an audience meant by them.
Precision. Telegram publishes reaction counts per emoji and short-forms each one — 4.34K, 1.2M — so any single kind at or above 1,000 reaches us at three significant figures, and only counts below 1,000 are exact. The shares above are ratios of those figures and carry the same error. This is also why the total here can differ slightly from a reaction total printed elsewhere on the page: both are sums of the same rounded parts, taken over samples with different edges.
Coverage. Reactions were read on 2 of the 20 sampled posts in this sample. Summed by Telegram’s own count on each post — not by adding up the per-emoji breakdown above — those same posts carry 3 reactions in total: the kind of figure the paragraph above means by “a reaction total printed elsewhere on the page”.
Measured over the 20 most recent posts we hold, published 19 July 2026 to 6 August 2026, using the newest reading held for each. Telegram Stars are excluded: they are a payment, not a reaction, and they have their own section.
Recent posts
You Can Be an Information Writer Duncan Long Many people want to be writers. Most never realize their dream or settle for writing for free in a local paper or an obscure newsletter. This is a shame because almost anyone who wants to become a published writer or even make a living as a writer can do so if they know a few tricks and are dilligent in their efforts toward creating a writing career. This book will deal …
Using Offshore Havens for Privacy and Profit In the U.S. our lives have become transparent to nosy, greedy government agencies. That's why there is a growing flight of U.S. capital abroad to safer, more inflationproof, investment-friendly countries. Using layman's terms, Adam Starchild walks you through the reasons to invest overseas, ways to do it and where to entrust your money. Order PDF https://berserker.biz/u…
Countering Hostile Surveillance From the author of the highly regarded training manuals Secrets of Surveillance and Surveillance Countermeasures comes the next course in identifying and evading hostile surveillance in the real world. Every day in all parts of the world, hostile surveillance forces are stalking and exploiting unwitting prey - be they private citizens, corporate employees or national security agents. …
Building With Junk & Other Good Stuff Building With Junk is an excellent guide for owner/builders who are trying to build an affordable and interesting home for themselves using recycled or used materials. It provides ideas for sources of scrounged materials, methods of using thrown-out materials without violating building codes, and support for people who are interested in experimenting with non-standard building te…
❤1
Crime Scene Search And Physical Evidence Handbook This manual spells out legal and scientific standards for processing evidence in solving crimes. Fingerprints, fibers, drug residue and altered documents involved in fires and murders are just some of the topics covered. Order PDF https://berserker.biz/crime-scene-search-and-physical-evidence-handbook/
Deception Detection: Winning the Polygraph Game Fear is the polygrapher's most powerful weapon, but you can defend yourself All it takes is a little know-how and some concentration and practice. Arm yourself with these proven effective tactics for rendering the polygrapher impotent in his efforts to intimidate and manipulate you, and learn how to beat it. Order PDF https://berserker.biz/deception-detection-winning…
Electronic Circuits And Secrets Of An Old Fashioned Spy Learn to build bugs or take advantage of those already in place; assemble a DFMF decoder or decode phone tones without one; construct a red box for free pay phone calls; crack answering machine passwords; defeat digital and spread-spectrum cordless phones with an FM phone tap; and much more! For academic study only. Order PDF https://berserker.biz/electronic-…
Escape from Controlled Custody Tony Lesce Professional methods and techniques for information and intelligence gathering... now revealed for you to use. Now you can find out anything you want to know about anyone you want to know about! Satisfy your need to know with these revealing professional manuals on investigation, crime and police sciences. Behind every escape is the will to survive. Right now, there are peo…
Expatriate's Employment Handbook - Seeing the World and Getting Paid for It! Dennis Riley A Handbook detailing how to obtain work in other countries Order PDF https://berserker.biz/expatriates-employment-handbook-seeing-the-world-and-getting-paid-for-it/
Flim-Flam Man Allen Henderson A Handbook on how con games work by an expert Order PDF https://berserker.biz/flim-flam-man/
How To Open Handcuffs Carl Roper A technical manual on the mechanics of handcuffs and how to open them. Order PDF https://berserker.biz/how-to-open-handcuffs/
Showing the 12 most recent of 20 posts we hold for @berserkerbooks. View and reaction counts are the latest single reading for each post, not a live figure, and a recent post is still accumulating both. A view count marked ≈ was rounded by Telegram before we ever saw it — t.me prints views in full below 1,000 and to three significant figures above, so ≈1,200,000 means somewhere between 1,150,000 and 1,249,999. Unmarked counts are exact. Text is reproduced from the public post preview and truncated for length.
Mentions
Named by 1 registered channel — every channel on the register whose own posts have named this one, by its current username or any other username it currently holds, merged from two separately captured readings of the same fact so a namer caught by only one of them is not missed and a namer both caught is not counted twice. A username this channel has since dropped is not matched — that handle may belong to someone else now, and crediting today’s namer to yesterday’s owner would misattribute it.
Named by
Channels on the register whose posts name this channel's handle.
A mention is a weaker signal than a forward and is counted separately for that reason — naming a channel is not republishing it, and a handle in a post body is easy to place deliberately. The post counts beside each row below are distinct posts in which the handle appeared, from posts we have read on both sides — the “Named by N registered channels” figure above is a different count, of distinct NAMING CHANNELS rather than posts, and is not the sum of the rows under it.
Cite this entry
A live page changes as we take new readings, so a citation should name the measurement it is based on, not just the URL. The line below cites the subscriber count as measured 6 September 2026 — this entry's latest reading, not the date you are reading this.
“Berserker Books” (@berserkerbooks), 295 subscribers as measured 6 September 2026. Telegram Register, tgregister.com/channel/berserkerbooks.
Full measurement history, CC BY 4.0. Every reading this register holds for this entry, not just the latest one, as a dated, downloadable record: CSV · JSON. Free to use with attribution to tgregister.com. Each file carries its own generation timestamp, which is the figure to cite for exactly when the data was retrieved.