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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/ink.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='US Secret Service Laboratory Studies Ink to Solve Crimes' data-article-id='3983'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='8958'>A large collection of ink samples fills storage space at a small laboratory in Washington, D.C.</span> <span data-start-time='8958' data-end-time='17417'>The samples are kept inside a mix of soft, plastic bottles and small glass containers.</span> <span data-start-time='17417' data-end-time='28479'>To the untrained eye, they are just a lot of dark liquids with strange names like “moldy sponge” or “green grass.”</span> <span data-start-time='28479' data-end-time='39563'>But to the United States Secret Service agents who use the ink samples, they could provide information that saves the life of the president.</span> <span data-start-time='39563' data-end-time='47854'>Agents say the samples also could help them stop criminals from reproducing money illegally.</span> <span data-start-time='47854' data-end-time='55375'>The ink library at the laboratory has more than 15,000 samples.</span> <span data-start-time='55375' data-end-time='63250'>They come from writing instruments and printing machines dating back more than 85 years.</span> <span data-start-time='63250' data-end-time='69438'>The collection is the result of one man, Antonio Cantu.</span> <span data-start-time='69438' data-end-time='74083'>He started collecting samples in the 1960s.</span> <span data-start-time='74083' data-end-time='81063'>Cantu was a well-known investigator and former chief chemist at the Secret Service.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/3503/ink.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=13291 data-hint-location='8958' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/what_does_sample_mean.wav'>What does sample mean?</div><div class='choices' data-correct-choice='small amount of something'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/reproduce_money.wav'><span>reproduce money</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/small_amount_of_something.wav'><span>small amount of something</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/dark_liquids.wav'><span>dark liquids</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/glass_containers.wav'><span>glass containers</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=13292 data-hint-location='28479' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/which_agency_uses_the_ink_samples.wav'>Which agency uses the ink samples?</div><div class='choices' data-correct-choice='Secret Service'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/local_authorities.wav'><span>local authorities</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/secret_service.wav'><span>Secret Service</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/federal_bureau_of_investigation.wav'><span>Federal Bureau of Investigation</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/central_intelligence_agency.wav'><span>Central Intelligence Agency</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=13293 data-hint-location='55375' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/the_samples_come_from_writing_instruments_and__blank_.wav'>The samples come from writing instruments and <span class='blank'>printing machines</span>.</div><div class='choices' data-correct-choice='printing machines'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/computer_programs.wav'><span>computer programs</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/illegal_money.wav'><span>illegal money</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/printing_machines.wav'><span>printing machines</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3503/the_secret_service.wav'><span>the Secret Service</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button 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