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'roundthehorn · 06-28-2009, 11:17 PM

According the FAQs on Ritchie Navigation (http://www.ritchienavigation.com/service/faq.html) site:

"Until 2001, all Ritchie compasses (see exception) were filled with odorless mineral spirits. Ritchie now uses a fluid called Isopar L® that has similar properties but some added benefits over odorless mineral spirits. These can be mixed together.

Exception: Some old style Flat Top Compasses used a mix of isopropyl alcohol and water. This process was stopped in the 1960s. If you have a Flat Top Compass, it is recommended that you test the fluid to see if it is odorless mineral spirits or isopropyl alcohol."

FYI - Isopar is the brand name for a series of products from ExxonMobile.

06-28-2009, 11:17 PM	#16
'roundthehorn Registered User Join Date: Oct 2004 Location: Puget Sound Posts: 114	According the FAQs on Ritchie Navigation (http://www.ritchienavigation.com/service/faq.html) site: "Until 2001, all Ritchie compasses (see exception) were filled with odorless mineral spirits. Ritchie now uses a fluid called Isopar L® that has similar properties but some added benefits over odorless mineral spirits. These can be mixed together. Exception: Some old style Flat Top Compasses used a mix of isopropyl alcohol and water. This process was stopped in the 1960s. If you have a Flat Top Compass, it is recommended that you test the fluid to see if it is odorless mineral spirits or isopropyl alcohol." FYI - Isopar is the brand name for a series of products from ExxonMobile.