Could possibly weigh the foam thats soaked in ink then wash the foam to remove the ink and dry it out then weight it again and compare. Might not be very accurate but it would be an attempt at closer numbers at least.
Could possibly weigh the foam thats soaked in ink then wash the foam to remove the ink and dry it out then weight it again and compare. Might not be very accurate but it would be an attempt at closer numbers at least.