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In another test variation the target was written in invisible (sympathetic) ink,...

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📅 01.01.1922 · Eksperymenty i relacje o S. Ossowieckim · 👁️ 20

"In another test variation the target was written in invisible (sympathetic) ink, undetectable to the naked eye, to make ordinary visual reading harder; this trial too was reported as a success for Ossowiecki." "W innym wariancie testów cel zapisywano atramentem sympatycznym (niewidocznym gołym okiem), aby utrudnić odczyt zwykłą obserwacją; próbę tę również relacjonowano jako zakończoną sukcesem Ossowieckiego."
🌐 (Machine-translated — original in Polish) · oryginał w języku polskim
🔮 Forecast 🔹 science Short timeframe (under 1 year) AI Confidence: 40% Assertiveness: medium Source

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