Simply make a small mark on U.S. currency.
Chemically sensitive ink works instantly.
Amber mark passes the test, while a dark brown or black mark means the bill
ENGAGING: Features vibrant illustrations of money bills and coins to keep learners engaged while learning basic concepts; 33 time learning cards, 1 money index card, 1 blank card, 1 instruction...
One part receipt form with stub that remains in the book for records
50 sheets per book
50 lb. white paper
2-3/4" x 7-15/16" sheet size
5-15/16" x 2-3/4" detached form size