Yes, any non-glossy paper such as A4 size letter head or printing paper would do .

Some people here uses coffee filter paper that seems to 'differentiate' the blotter contrast better , IMO .

As suggested, sample is best taken after more than 20 minutes - an hour or more of  driving and ..........

within 20 minutes of engine shut down while engine oil is hot/warm and not cold .

This technique may be used on gear oils etc , other than engine oils or saloon cars .